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Simplifying -1x + 87 = 91 + -3x Reorder the terms: 87 + -1x = 91 + -3x Solving 87 + -1x = 91 + -3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3x' to each side of the equation. 87 + -1x + 3x = 91 + -3x + 3x Combine like terms: -1x + 3x = 2x 87 + 2x = 91 + -3x + 3x Combine like terms: -3x + 3x = 0 87 + 2x = 91 + 0 87 + 2x = 91 Add '-87' to each side of the equation. 87 + -87 + 2x = 91 + -87 Combine like terms: 87 + -87 = 0 0 + 2x = 91 + -87 2x = 91 + -87 Combine like terms: 91 + -87 = 4 2x = 4 Divide each side by '2'. x = 2 Simplifying x = 2
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