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Simplifying 7 + (x + -3) = 12 + -1x Reorder the terms: 7 + (-3 + x) = 12 + -1x Remove parenthesis around (-3 + x) 7 + -3 + x = 12 + -1x Combine like terms: 7 + -3 = 4 4 + x = 12 + -1x Solving 4 + x = 12 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 4 + x + x = 12 + -1x + x Combine like terms: x + x = 2x 4 + 2x = 12 + -1x + x Combine like terms: -1x + x = 0 4 + 2x = 12 + 0 4 + 2x = 12 Add '-4' to each side of the equation. 4 + -4 + 2x = 12 + -4 Combine like terms: 4 + -4 = 0 0 + 2x = 12 + -4 2x = 12 + -4 Combine like terms: 12 + -4 = 8 2x = 8 Divide each side by '2'. x = 4 Simplifying x = 4
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