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Simplifying 7r + -2(r + -9) = 58 Reorder the terms: 7r + -2(-9 + r) = 58 7r + (-9 * -2 + r * -2) = 58 7r + (18 + -2r) = 58 Reorder the terms: 18 + 7r + -2r = 58 Combine like terms: 7r + -2r = 5r 18 + 5r = 58 Solving 18 + 5r = 58 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 5r = 58 + -18 Combine like terms: 18 + -18 = 0 0 + 5r = 58 + -18 5r = 58 + -18 Combine like terms: 58 + -18 = 40 5r = 40 Divide each side by '5'. r = 8 Simplifying r = 8
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