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Simplifying -8(1 + -2r) + -1 = 87 (1 * -8 + -2r * -8) + -1 = 87 (-8 + 16r) + -1 = 87 Reorder the terms: -8 + -1 + 16r = 87 Combine like terms: -8 + -1 = -9 -9 + 16r = 87 Solving -9 + 16r = 87 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 16r = 87 + 9 Combine like terms: -9 + 9 = 0 0 + 16r = 87 + 9 16r = 87 + 9 Combine like terms: 87 + 9 = 96 16r = 96 Divide each side by '16'. r = 6 Simplifying r = 6
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