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Simplifying -3(8r + -7) + 7 = 100 Reorder the terms: -3(-7 + 8r) + 7 = 100 (-7 * -3 + 8r * -3) + 7 = 100 (21 + -24r) + 7 = 100 Reorder the terms: 21 + 7 + -24r = 100 Combine like terms: 21 + 7 = 28 28 + -24r = 100 Solving 28 + -24r = 100 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 + -24r = 100 + -28 Combine like terms: 28 + -28 = 0 0 + -24r = 100 + -28 -24r = 100 + -28 Combine like terms: 100 + -28 = 72 -24r = 72 Divide each side by '-24'. r = -3 Simplifying r = -3
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