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Simplifying -2x + 7 + -1(-3x) = 12 Remove parenthesis around (-3x) -2x + 7 + -1 * -3x = 12 Multiply -1 * -3 -2x + 7 + 3x = 12 Reorder the terms: 7 + -2x + 3x = 12 Combine like terms: -2x + 3x = 1x 7 + 1x = 12 Solving 7 + 1x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 1x = 12 + -7 Combine like terms: 7 + -7 = 0 0 + 1x = 12 + -7 1x = 12 + -7 Combine like terms: 12 + -7 = 5 1x = 5 Divide each side by '1'. x = 5 Simplifying x = 5
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