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Simplifying x + -15 = 87 + -1x Reorder the terms: -15 + x = 87 + -1x Solving -15 + x = 87 + -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. -15 + x + x = 87 + -1x + x Combine like terms: x + x = 2x -15 + 2x = 87 + -1x + x Combine like terms: -1x + x = 0 -15 + 2x = 87 + 0 -15 + 2x = 87 Add '15' to each side of the equation. -15 + 15 + 2x = 87 + 15 Combine like terms: -15 + 15 = 0 0 + 2x = 87 + 15 2x = 87 + 15 Combine like terms: 87 + 15 = 102 2x = 102 Divide each side by '2'. x = 51 Simplifying x = 51
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