Variable - a letter or symbol used to represent and unknown number., Coefficient - The number the variable in an equation is being multiplied or divided by., Constant - The number in an equation that is being added or subtracted., Term - Parts of an expression or equation separated by an addition or subtraction sign., Equation - A number statement that shows that two quanities are equal., Expression - A number statement that does NOT have an equals sign., What is the variable in: 2x + 9 = 89 - x, What is the coefficient in: 2x + 9 = 89 - 2, What is the constant in: 2x + 9 = 89 - 9, What are the terms in: 2x + 9 = 89 - 2x and 9, What is the coefficient in: r + 9 = 7 - 1,

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