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Simplifying 3r + -4(2r + -5) = -15 Reorder the terms: 3r + -4(-5 + 2r) = -15 3r + (-5 * -4 + 2r * -4) = -15 3r + (20 + -8r) = -15 Reorder the terms: 20 + 3r + -8r = -15 Combine like terms: 3r + -8r = -5r 20 + -5r = -15 Solving 20 + -5r = -15 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + -5r = -15 + -20 Combine like terms: 20 + -20 = 0 0 + -5r = -15 + -20 -5r = -15 + -20 Combine like terms: -15 + -20 = -35 -5r = -35 Divide each side by '-5'. r = 7 Simplifying r = 7
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