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Simplifying -108 = -4(6 + 7r) -108 = (6 * -4 + 7r * -4) -108 = (-24 + -28r) Solving -108 = -24 + -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. -108 + 28r = -24 + -28r + 28r Combine like terms: -28r + 28r = 0 -108 + 28r = -24 + 0 -108 + 28r = -24 Add '108' to each side of the equation. -108 + 108 + 28r = -24 + 108 Combine like terms: -108 + 108 = 0 0 + 28r = -24 + 108 28r = -24 + 108 Combine like terms: -24 + 108 = 84 28r = 84 Divide each side by '28'. r = 3 Simplifying r = 3
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