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Simplifying 120 = -4(5 + -7r) 120 = (5 * -4 + -7r * -4) 120 = (-20 + 28r) Solving 120 = -20 + 28r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-28r' to each side of the equation. 120 + -28r = -20 + 28r + -28r Combine like terms: 28r + -28r = 0 120 + -28r = -20 + 0 120 + -28r = -20 Add '-120' to each side of the equation. 120 + -120 + -28r = -20 + -120 Combine like terms: 120 + -120 = 0 0 + -28r = -20 + -120 -28r = -20 + -120 Combine like terms: -20 + -120 = -140 -28r = -140 Divide each side by '-28'. r = 5 Simplifying r = 5
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