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Simplifying 2(x + -1) + -7 = 15 Reorder the terms: 2(-1 + x) + -7 = 15 (-1 * 2 + x * 2) + -7 = 15 (-2 + 2x) + -7 = 15 Reorder the terms: -2 + -7 + 2x = 15 Combine like terms: -2 + -7 = -9 -9 + 2x = 15 Solving -9 + 2x = 15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 2x = 15 + 9 Combine like terms: -9 + 9 = 0 0 + 2x = 15 + 9 2x = 15 + 9 Combine like terms: 15 + 9 = 24 2x = 24 Divide each side by '2'. x = 12 Simplifying x = 12
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