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Simplifying 3(5 + -1r) = 3r (5 * 3 + -1r * 3) = 3r (15 + -3r) = 3r Solving 15 + -3r = 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. 15 + -3r + -3r = 3r + -3r Combine like terms: -3r + -3r = -6r 15 + -6r = 3r + -3r Combine like terms: 3r + -3r = 0 15 + -6r = 0 Add '-15' to each side of the equation. 15 + -15 + -6r = 0 + -15 Combine like terms: 15 + -15 = 0 0 + -6r = 0 + -15 -6r = 0 + -15 Combine like terms: 0 + -15 = -15 -6r = -15 Divide each side by '-6'. r = 2.5 Simplifying r = 2.5
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