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Simplifying -4(5r + -7) = -132 Reorder the terms: -4(-7 + 5r) = -132 (-7 * -4 + 5r * -4) = -132 (28 + -20r) = -132 Solving 28 + -20r = -132 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + -20r = -132 + -28 Combine like terms: 28 + -28 = 0 0 + -20r = -132 + -28 -20r = -132 + -28 Combine like terms: -132 + -28 = -160 -20r = -160 Divide each side by '-20'. r = 8 Simplifying r = 8
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