addition property of equality

For all real numbers a, b, and c, if a = b, then a + c = b + c. If two expressions are equal to each other and you add the same value to both sides of the equation, the equation will remain equal.

coefficientA number that multiplies a variable.
constantA symbol that represents a quantity that cannot change. It can be a number, letter or a symbol.
equationA mathematical statement that two expressions are equal.
expressionA mathematical phrase that can contain a combination of numbers, variables, or operations.
isolate a variableA method for solving an equation that involves rewriting an equivalent equation in which the variable is on one side of the equation and everything else is on the other side of the equation.
multiplication property of equality

For all real numbers a, b, and c, c 0: If a = b, then ac = bc. If two expressions are equal to each other and you multiply both sides of the equation by the same non-zero number, the equation will remain equal.

one-step equationAn equation that requires only one step to solve.
term

A number or product of a number and variables raised to powers.  4x, −5y2, 6, and x3y4 are all examples of terms.

variableA letter or symbol used to represent a quantity that can change.