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Simplifying 15(x + -1) = -3(5 + -1x) + 12x Reorder the terms: 15(-1 + x) = -3(5 + -1x) + 12x (-1 * 15 + x * 15) = -3(5 + -1x) + 12x (-15 + 15x) = -3(5 + -1x) + 12x -15 + 15x = (5 * -3 + -1x * -3) + 12x -15 + 15x = (-15 + 3x) + 12x Combine like terms: 3x + 12x = 15x -15 + 15x = -15 + 15x Add '15' to each side of the equation. -15 + 15 + 15x = -15 + 15 + 15x Combine like terms: -15 + 15 = 0 0 + 15x = -15 + 15 + 15x 15x = -15 + 15 + 15x Combine like terms: -15 + 15 = 0 15x = 0 + 15x 15x = 15x Add '-15x' to each side of the equation. 15x + -15x = 15x + -15x Combine like terms: 15x + -15x = 0 0 = 15x + -15x Combine like terms: 15x + -15x = 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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