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Simplifying 180 = -10(-7 + r) 180 = (-7 * -10 + r * -10) 180 = (70 + -10r) Solving 180 = 70 + -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. 180 + 10r = 70 + -10r + 10r Combine like terms: -10r + 10r = 0 180 + 10r = 70 + 0 180 + 10r = 70 Add '-180' to each side of the equation. 180 + -180 + 10r = 70 + -180 Combine like terms: 180 + -180 = 0 0 + 10r = 70 + -180 10r = 70 + -180 Combine like terms: 70 + -180 = -110 10r = -110 Divide each side by '10'. r = -11 Simplifying r = -11
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