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Simplifying -12x + -9 = -3(3 + 4x) Reorder the terms: -9 + -12x = -3(3 + 4x) -9 + -12x = (3 * -3 + 4x * -3) -9 + -12x = (-9 + -12x) Add '9' to each side of the equation. -9 + 9 + -12x = -9 + 9 + -12x Combine like terms: -9 + 9 = 0 0 + -12x = -9 + 9 + -12x -12x = -9 + 9 + -12x Combine like terms: -9 + 9 = 0 -12x = 0 + -12x -12x = -12x Add '12x' to each side of the equation. -12x + 12x = -12x + 12x Combine like terms: -12x + 12x = 0 0 = -12x + 12x Combine like terms: -12x + 12x = 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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