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Simplifying 87 = x + (x + -43) Reorder the terms: 87 = x + (-43 + x) Remove parenthesis around (-43 + x) 87 = x + -43 + x Reorder the terms: 87 = -43 + x + x Combine like terms: x + x = 2x 87 = -43 + 2x Solving 87 = -43 + 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 = -43 + 2x + -2x Combine like terms: 2x + -2x = 0 87 + -2x = -43 + 0 87 + -2x = -43 Add '-87' to each side of the equation. 87 + -87 + -2x = -43 + -87 Combine like terms: 87 + -87 = 0 0 + -2x = -43 + -87 -2x = -43 + -87 Combine like terms: -43 + -87 = -130 -2x = -130 Divide each side by '-2'. x = 65 Simplifying x = 65
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