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Simplifying 13r + 12 = 137 + -12r Reorder the terms: 12 + 13r = 137 + -12r Solving 12 + 13r = 137 + -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. 12 + 13r + 12r = 137 + -12r + 12r Combine like terms: 13r + 12r = 25r 12 + 25r = 137 + -12r + 12r Combine like terms: -12r + 12r = 0 12 + 25r = 137 + 0 12 + 25r = 137 Add '-12' to each side of the equation. 12 + -12 + 25r = 137 + -12 Combine like terms: 12 + -12 = 0 0 + 25r = 137 + -12 25r = 137 + -12 Combine like terms: 137 + -12 = 125 25r = 125 Divide each side by '25'. r = 5 Simplifying r = 5
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