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Simplifying -12(r + -12) = 408 Reorder the terms: -12(-12 + r) = 408 (-12 * -12 + r * -12) = 408 (144 + -12r) = 408 Solving 144 + -12r = 408 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-144' to each side of the equation. 144 + -144 + -12r = 408 + -144 Combine like terms: 144 + -144 = 0 0 + -12r = 408 + -144 -12r = 408 + -144 Combine like terms: 408 + -144 = 264 -12r = 264 Divide each side by '-12'. r = -22 Simplifying r = -22
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