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Simplifying -3(3x + -1) + 9 = -9x + 12 Reorder the terms: -3(-1 + 3x) + 9 = -9x + 12 (-1 * -3 + 3x * -3) + 9 = -9x + 12 (3 + -9x) + 9 = -9x + 12 Reorder the terms: 3 + 9 + -9x = -9x + 12 Combine like terms: 3 + 9 = 12 12 + -9x = -9x + 12 Reorder the terms: 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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