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Simplifying -15 + -2x = 12 + x Solving -15 + -2x = 12 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -15 + -2x + -1x = 12 + x + -1x Combine like terms: -2x + -1x = -3x -15 + -3x = 12 + x + -1x Combine like terms: x + -1x = 0 -15 + -3x = 12 + 0 -15 + -3x = 12 Add '15' to each side of the equation. -15 + 15 + -3x = 12 + 15 Combine like terms: -15 + 15 = 0 0 + -3x = 12 + 15 -3x = 12 + 15 Combine like terms: 12 + 15 = 27 -3x = 27 Divide each side by '-3'. x = -9 Simplifying x = -9
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