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Simplifying 79 = 7 + -9r Solving 79 = 7 + -9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9r' to each side of the equation. 79 + 9r = 7 + -9r + 9r Combine like terms: -9r + 9r = 0 79 + 9r = 7 + 0 79 + 9r = 7 Add '-79' to each side of the equation. 79 + -79 + 9r = 7 + -79 Combine like terms: 79 + -79 = 0 0 + 9r = 7 + -79 9r = 7 + -79 Combine like terms: 7 + -79 = -72 9r = -72 Divide each side by '9'. r = -8 Simplifying r = -8
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