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Simplifying -81 = -1(x + -7) + -15 Reorder the terms: -81 = -1(-7 + x) + -15 -81 = (-7 * -1 + x * -1) + -15 -81 = (7 + -1x) + -15 Reorder the terms: -81 = 7 + -15 + -1x Combine like terms: 7 + -15 = -8 -81 = -8 + -1x Solving -81 = -8 + -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. -81 + x = -8 + -1x + x Combine like terms: -1x + x = 0 -81 + x = -8 + 0 -81 + x = -8 Add '81' to each side of the equation. -81 + 81 + x = -8 + 81 Combine like terms: -81 + 81 = 0 0 + x = -8 + 81 x = -8 + 81 Combine like terms: -8 + 81 = 73 x = 73 Simplifying x = 73
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