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Simplifying 120 = -6 + -1r + 4r Combine like terms: -1r + 4r = 3r 120 = -6 + 3r Solving 120 = -6 + 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. 120 + -3r = -6 + 3r + -3r Combine like terms: 3r + -3r = 0 120 + -3r = -6 + 0 120 + -3r = -6 Add '-120' to each side of the equation. 120 + -120 + -3r = -6 + -120 Combine like terms: 120 + -120 = 0 0 + -3r = -6 + -120 -3r = -6 + -120 Combine like terms: -6 + -120 = -126 -3r = -126 Divide each side by '-3'. r = 42 Simplifying r = 42
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