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Simplifying -144 = -3(6 + -6r) -144 = (6 * -3 + -6r * -3) -144 = (-18 + 18r) Solving -144 = -18 + 18r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-18r' to each side of the equation. -144 + -18r = -18 + 18r + -18r Combine like terms: 18r + -18r = 0 -144 + -18r = -18 + 0 -144 + -18r = -18 Add '144' to each side of the equation. -144 + 144 + -18r = -18 + 144 Combine like terms: -144 + 144 = 0 0 + -18r = -18 + 144 -18r = -18 + 144 Combine like terms: -18 + 144 = 126 -18r = 126 Divide each side by '-18'. r = -7 Simplifying r = -7
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