Example

Classifying 4+9(3x7)=42x13+23(3x2)4 + 9(3x - 7) = -42x - 13 + 23(3x - 2)

To classify the algebraic equation 4+9(3x7)=42x13+23(3x2)4 + 9(3x - 7) = -42x - 13 + 23(3x - 2), first simplify both sides. Distributing on the left side gives 4+27x634 + 27x - 63, which combines to 27x5927x - 59. Distributing on the right side yields 42x13+69x46-42x - 13 + 69x - 46. Grouping the like terms on the right (42x+69x-42x + 69x and 1346-13 - 46) also simplifies to 27x5927x - 59. Equating the simplified sides results in 27x59=27x5927x - 59 = 27x - 59. Subtracting 27x27x from both sides eliminates the variable entirely, leaving the unconditionally true numerical statement 59=59-59 = -59. Consequently, the equation is an identity, and its solution is all real numbers.

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Updated 2026-04-22

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Ch.2 Solving Linear Equations - Intermediate Algebra @ OpenStax

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