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Simplifying 7 = 15 + -2(x + 1) Reorder the terms: 7 = 15 + -2(1 + x) 7 = 15 + (1 * -2 + x * -2) 7 = 15 + (-2 + -2x) Combine like terms: 15 + -2 = 13 7 = 13 + -2x Solving 7 = 13 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. 7 + 2x = 13 + -2x + 2x Combine like terms: -2x + 2x = 0 7 + 2x = 13 + 0 7 + 2x = 13 Add '-7' to each side of the equation. 7 + -7 + 2x = 13 + -7 Combine like terms: 7 + -7 = 0 0 + 2x = 13 + -7 2x = 13 + -7 Combine like terms: 13 + -7 = 6 2x = 6 Divide each side by '2'. x = 3 Simplifying x = 3
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