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Simplifying 7r + -2(6r + -5) = 20 Reorder the terms: 7r + -2(-5 + 6r) = 20 7r + (-5 * -2 + 6r * -2) = 20 7r + (10 + -12r) = 20 Reorder the terms: 10 + 7r + -12r = 20 Combine like terms: 7r + -12r = -5r 10 + -5r = 20 Solving 10 + -5r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + -5r = 20 + -10 Combine like terms: 10 + -10 = 0 0 + -5r = 20 + -10 -5r = 20 + -10 Combine like terms: 20 + -10 = 10 -5r = 10 Divide each side by '-5'. r = -2 Simplifying r = -2
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