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Simplifying 120 = 4(r + -3) Reorder the terms: 120 = 4(-3 + r) 120 = (-3 * 4 + r * 4) 120 = (-12 + 4r) Solving 120 = -12 + 4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4r' to each side of the equation. 120 + -4r = -12 + 4r + -4r Combine like terms: 4r + -4r = 0 120 + -4r = -12 + 0 120 + -4r = -12 Add '-120' to each side of the equation. 120 + -120 + -4r = -12 + -120 Combine like terms: 120 + -120 = 0 0 + -4r = -12 + -120 -4r = -12 + -120 Combine like terms: -12 + -120 = -132 -4r = -132 Divide each side by '-4'. r = 33 Simplifying r = 33
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