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Simplifying -140 = 4(5 + -4r) -140 = (5 * 4 + -4r * 4) -140 = (20 + -16r) Solving -140 = 20 + -16r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '16r' to each side of the equation. -140 + 16r = 20 + -16r + 16r Combine like terms: -16r + 16r = 0 -140 + 16r = 20 + 0 -140 + 16r = 20 Add '140' to each side of the equation. -140 + 140 + 16r = 20 + 140 Combine like terms: -140 + 140 = 0 0 + 16r = 20 + 140 16r = 20 + 140 Combine like terms: 20 + 140 = 160 16r = 160 Divide each side by '16'. r = 10 Simplifying r = 10
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