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Simplifying -7 + 9(r + -5) = 20 Reorder the terms: -7 + 9(-5 + r) = 20 -7 + (-5 * 9 + r * 9) = 20 -7 + (-45 + 9r) = 20 Combine like terms: -7 + -45 = -52 -52 + 9r = 20 Solving -52 + 9r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '52' to each side of the equation. -52 + 52 + 9r = 20 + 52 Combine like terms: -52 + 52 = 0 0 + 9r = 20 + 52 9r = 20 + 52 Combine like terms: 20 + 52 = 72 9r = 72 Divide each side by '9'. r = 8 Simplifying r = 8
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