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Simplifying 120 = -6(-6 + -7r) 120 = (-6 * -6 + -7r * -6) 120 = (36 + 42r) Solving 120 = 36 + 42r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-42r' to each side of the equation. 120 + -42r = 36 + 42r + -42r Combine like terms: 42r + -42r = 0 120 + -42r = 36 + 0 120 + -42r = 36 Add '-120' to each side of the equation. 120 + -120 + -42r = 36 + -120 Combine like terms: 120 + -120 = 0 0 + -42r = 36 + -120 -42r = 36 + -120 Combine like terms: 36 + -120 = -84 -42r = -84 Divide each side by '-42'. r = 2 Simplifying r = 2
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