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Simplifying -87 = x + x Combine like terms: x + x = 2x -87 = 2x Solving -87 = 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. -87 + -2x = 2x + -2x Combine like terms: 2x + -2x = 0 -87 + -2x = 0 Add '87' to each side of the equation. -87 + 87 + -2x = 0 + 87 Combine like terms: -87 + 87 = 0 0 + -2x = 0 + 87 -2x = 0 + 87 Combine like terms: 0 + 87 = 87 -2x = 87 Divide each side by '-2'. x = -43.5 Simplifying x = -43.5
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