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Simplifying -2x + x + 12 = 78 Reorder the terms: 12 + -2x + x = 78 Combine like terms: -2x + x = -1x 12 + -1x = 78 Solving 12 + -1x = 78 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -1x = 78 + -12 Combine like terms: 12 + -12 = 0 0 + -1x = 78 + -12 -1x = 78 + -12 Combine like terms: 78 + -12 = 66 -1x = 66 Divide each side by '-1'. x = -66 Simplifying x = -66
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