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Simplifying 3x + 6x + -12 = 4(2x + -3) + x Reorder the terms: -12 + 3x + 6x = 4(2x + -3) + x Combine like terms: 3x + 6x = 9x -12 + 9x = 4(2x + -3) + x Reorder the terms: -12 + 9x = 4(-3 + 2x) + x -12 + 9x = (-3 * 4 + 2x * 4) + x -12 + 9x = (-12 + 8x) + x Combine like terms: 8x + x = 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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