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Simplifying -2(-5 + 5r) = -18 + -3r (-5 * -2 + 5r * -2) = -18 + -3r (10 + -10r) = -18 + -3r Solving 10 + -10r = -18 + -3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3r' to each side of the equation. 10 + -10r + 3r = -18 + -3r + 3r Combine like terms: -10r + 3r = -7r 10 + -7r = -18 + -3r + 3r Combine like terms: -3r + 3r = 0 10 + -7r = -18 + 0 10 + -7r = -18 Add '-10' to each side of the equation. 10 + -10 + -7r = -18 + -10 Combine like terms: 10 + -10 = 0 0 + -7r = -18 + -10 -7r = -18 + -10 Combine like terms: -18 + -10 = -28 -7r = -28 Divide each side by '-7'. r = 4 Simplifying r = 4
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