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Simplifying 87 = 7 + -10r Solving 87 = 7 + -10r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '10r' to each side of the equation. 87 + 10r = 7 + -10r + 10r Combine like terms: -10r + 10r = 0 87 + 10r = 7 + 0 87 + 10r = 7 Add '-87' to each side of the equation. 87 + -87 + 10r = 7 + -87 Combine like terms: 87 + -87 = 0 0 + 10r = 7 + -87 10r = 7 + -87 Combine like terms: 7 + -87 = -80 10r = -80 Divide each side by '10'. r = -8 Simplifying r = -8
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