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Simplifying 18r + -1(8r + -7) = 67 Reorder the terms: 18r + -1(-7 + 8r) = 67 18r + (-7 * -1 + 8r * -1) = 67 18r + (7 + -8r) = 67 Reorder the terms: 7 + 18r + -8r = 67 Combine like terms: 18r + -8r = 10r 7 + 10r = 67 Solving 7 + 10r = 67 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 10r = 67 + -7 Combine like terms: 7 + -7 = 0 0 + 10r = 67 + -7 10r = 67 + -7 Combine like terms: 67 + -7 = 60 10r = 60 Divide each side by '10'. r = 6 Simplifying r = 6
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