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Simplifying -240 = 10(-10 + r) -240 = (-10 * 10 + r * 10) -240 = (-100 + 10r) Solving -240 = -100 + 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. -240 + -10r = -100 + 10r + -10r Combine like terms: 10r + -10r = 0 -240 + -10r = -100 + 0 -240 + -10r = -100 Add '240' to each side of the equation. -240 + 240 + -10r = -100 + 240 Combine like terms: -240 + 240 = 0 0 + -10r = -100 + 240 -10r = -100 + 240 Combine like terms: -100 + 240 = 140 -10r = 140 Divide each side by '-10'. r = -14 Simplifying r = -14
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