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Simplifying -1x + 87 = -7x + 9 Reorder the terms: 87 + -1x = -7x + 9 Reorder the terms: 87 + -1x = 9 + -7x Solving 87 + -1x = 9 + -7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7x' to each side of the equation. 87 + -1x + 7x = 9 + -7x + 7x Combine like terms: -1x + 7x = 6x 87 + 6x = 9 + -7x + 7x Combine like terms: -7x + 7x = 0 87 + 6x = 9 + 0 87 + 6x = 9 Add '-87' to each side of the equation. 87 + -87 + 6x = 9 + -87 Combine like terms: 87 + -87 = 0 0 + 6x = 9 + -87 6x = 9 + -87 Combine like terms: 9 + -87 = -78 6x = -78 Divide each side by '6'. x = -13 Simplifying x = -13
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