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Simplifying -8(-4r + 18) = 20r Reorder the terms: -8(18 + -4r) = 20r (18 * -8 + -4r * -8) = 20r (-144 + 32r) = 20r Solving -144 + 32r = 20r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-20r' to each side of the equation. -144 + 32r + -20r = 20r + -20r Combine like terms: 32r + -20r = 12r -144 + 12r = 20r + -20r Combine like terms: 20r + -20r = 0 -144 + 12r = 0 Add '144' to each side of the equation. -144 + 144 + 12r = 0 + 144 Combine like terms: -144 + 144 = 0 0 + 12r = 0 + 144 12r = 0 + 144 Combine like terms: 0 + 144 = 144 12r = 144 Divide each side by '12'. r = 12 Simplifying r = 12
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