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Simplifying 4r + 15 = 159 + -12r Reorder the terms: 15 + 4r = 159 + -12r Solving 15 + 4r = 159 + -12r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12r' to each side of the equation. 15 + 4r + 12r = 159 + -12r + 12r Combine like terms: 4r + 12r = 16r 15 + 16r = 159 + -12r + 12r Combine like terms: -12r + 12r = 0 15 + 16r = 159 + 0 15 + 16r = 159 Add '-15' to each side of the equation. 15 + -15 + 16r = 159 + -15 Combine like terms: 15 + -15 = 0 0 + 16r = 159 + -15 16r = 159 + -15 Combine like terms: 159 + -15 = 144 16r = 144 Divide each side by '16'. r = 9 Simplifying r = 9
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