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Simplifying -4(r + 18) = 68 Reorder the terms: -4(18 + r) = 68 (18 * -4 + r * -4) = 68 (-72 + -4r) = 68 Solving -72 + -4r = 68 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '72' to each side of the equation. -72 + 72 + -4r = 68 + 72 Combine like terms: -72 + 72 = 0 0 + -4r = 68 + 72 -4r = 68 + 72 Combine like terms: 68 + 72 = 140 -4r = 140 Divide each side by '-4'. r = -35 Simplifying r = -35
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