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Simplifying -3(3x + 4) = -12 + -9x Reorder the terms: -3(4 + 3x) = -12 + -9x (4 * -3 + 3x * -3) = -12 + -9x (-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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