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Simplifying 138 = -2 + 7r Solving 138 = -2 + 7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7r' to each side of the equation. 138 + -7r = -2 + 7r + -7r Combine like terms: 7r + -7r = 0 138 + -7r = -2 + 0 138 + -7r = -2 Add '-138' to each side of the equation. 138 + -138 + -7r = -2 + -138 Combine like terms: 138 + -138 = 0 0 + -7r = -2 + -138 -7r = -2 + -138 Combine like terms: -2 + -138 = -140 -7r = -140 Divide each side by '-7'. r = 20 Simplifying r = 20
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