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Simplifying 7 + 6(7 + 6r) = 157 7 + (7 * 6 + 6r * 6) = 157 7 + (42 + 36r) = 157 Combine like terms: 7 + 42 = 49 49 + 36r = 157 Solving 49 + 36r = 157 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-49' to each side of the equation. 49 + -49 + 36r = 157 + -49 Combine like terms: 49 + -49 = 0 0 + 36r = 157 + -49 36r = 157 + -49 Combine like terms: 157 + -49 = 108 36r = 108 Divide each side by '36'. r = 3 Simplifying r = 3
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