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Simplifying 5(4r + -1) + -20 = 155 Reorder the terms: 5(-1 + 4r) + -20 = 155 (-1 * 5 + 4r * 5) + -20 = 155 (-5 + 20r) + -20 = 155 Reorder the terms: -5 + -20 + 20r = 155 Combine like terms: -5 + -20 = -25 -25 + 20r = 155 Solving -25 + 20r = 155 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '25' to each side of the equation. -25 + 25 + 20r = 155 + 25 Combine like terms: -25 + 25 = 0 0 + 20r = 155 + 25 20r = 155 + 25 Combine like terms: 155 + 25 = 180 20r = 180 Divide each side by '20'. r = 9 Simplifying r = 9
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