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Simplifying 5r + -1(2r + 8) = 18 Reorder the terms: 5r + -1(8 + 2r) = 18 5r + (8 * -1 + 2r * -1) = 18 5r + (-8 + -2r) = 18 Reorder the terms: -8 + 5r + -2r = 18 Combine like terms: 5r + -2r = 3r -8 + 3r = 18 Solving -8 + 3r = 18 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + 3r = 18 + 8 Combine like terms: -8 + 8 = 0 0 + 3r = 18 + 8 3r = 18 + 8 Combine like terms: 18 + 8 = 26 3r = 26 Divide each side by '3'. r = 8.666666667 Simplifying r = 8.666666667
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