equation variables quantity sides mathematics identity expressions equal sign linear equation Dictionary literal equation differential equation state of being kwe Houghton Mifflin Company free encyclopedia partial differential equation mathematical equations arrow equality sign values that satisfy values dictionary x2 two sides Encyclopedia 3x Chemistry expression equals equality alphabet symbolic notation true equation subtraction injective 2D whole numbers distinction solution set Synonyms chemical reaction online dictionary equivalence products factors equalization Britannica Concise Encyclopedia Equation of motion linear array chemistry zh American Heritage symbolic equation math The American formulas Science Dictionary Mathematics origin chemical equation product O2 thesaurus unknowns atoms algebraic equation English dictionary system of equations polynomial Math Encyclopedia Britannica states encyclopedia differential equations Math equations amath Math problem solving derivative Ordinary Differential Equations theory velocity inverse operations unknown number derivatives second order first order independent variable formula nonlinear nonlinear differential equations linear differential equations Transposing difference equation existence approximation body other side student word algebra simple equation constant coefficient transpose logical sequence abcx px standard form y0 arithmetic Math tutors Tutorvista left-hand side left to right sides of an equation one side advanced Math Math concepts free trial equation math thesaurus browser balance weights levels grades how to tutors y-intercept y-axis plug in the line Equation of a Line x-value x0 Exercises graph of a function x-intercept tangent line slope slope of a curve point-slope form derivative of a function 2y mathematical theory