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Simplifying 85 = 5(1 + -4r) 85 = (1 * 5 + -4r * 5) 85 = (5 + -20r) Solving 85 = 5 + -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. 85 + 20r = 5 + -20r + 20r Combine like terms: -20r + 20r = 0 85 + 20r = 5 + 0 85 + 20r = 5 Add '-85' to each side of the equation. 85 + -85 + 20r = 5 + -85 Combine like terms: 85 + -85 = 0 0 + 20r = 5 + -85 20r = 5 + -85 Combine like terms: 5 + -85 = -80 20r = -80 Divide each side by '20'. r = -4 Simplifying r = -4
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