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Simplifying 3 + -1(r + -8) = 13 Reorder the terms: 3 + -1(-8 + r) = 13 3 + (-8 * -1 + r * -1) = 13 3 + (8 + -1r) = 13 Combine like terms: 3 + 8 = 11 11 + -1r = 13 Solving 11 + -1r = 13 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + -1r = 13 + -11 Combine like terms: 11 + -11 = 0 0 + -1r = 13 + -11 -1r = 13 + -11 Combine like terms: 13 + -11 = 2 -1r = 2 Divide each side by '-1'. r = -2 Simplifying r = -2
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