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Simplifying 9x + -12 = 3(3x + -4) Reorder the terms: -12 + 9x = 3(3x + -4) Reorder the terms: -12 + 9x = 3(-4 + 3x) -12 + 9x = (-4 * 3 + 3x * 3) -12 + 9x = (-12 + 9x) Add '12' to each side of the equation. -12 + 12 + 9x = -12 + 12 + 9x Combine like terms: -12 + 12 = 0 0 + 9x = -12 + 12 + 9x 9x = -12 + 12 + 9x Combine like terms: -12 + 12 = 0 9x = 0 + 9x 9x = 9x Add '-9x' to each side of the equation. 9x + -9x = 9x + -9x Combine like terms: 9x + -9x = 0 0 = 9x + -9x Combine like terms: 9x + -9x = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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