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Simplifying -113 = 7(8 + 4r) -113 = (8 * 7 + 4r * 7) -113 = (56 + 28r) Solving -113 = 56 + 28r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-28r' to each side of the equation. -113 + -28r = 56 + 28r + -28r Combine like terms: 28r + -28r = 0 -113 + -28r = 56 + 0 -113 + -28r = 56 Add '113' to each side of the equation. -113 + 113 + -28r = 56 + 113 Combine like terms: -113 + 113 = 0 0 + -28r = 56 + 113 -28r = 56 + 113 Combine like terms: 56 + 113 = 169 -28r = 169 Divide each side by '-28'. r = -6.035714286 Simplifying r = -6.035714286
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