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Simplifying 20 = 1.75(40 + r) 20 = (40 * 1.75 + r * 1.75) 20 = (70 + 1.75r) Solving 20 = 70 + 1.75r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1.75r' to each side of the equation. 20 + -1.75r = 70 + 1.75r + -1.75r Combine like terms: 1.75r + -1.75r = 0.00 20 + -1.75r = 70 + 0.00 20 + -1.75r = 70 Add '-20' to each side of the equation. 20 + -20 + -1.75r = 70 + -20 Combine like terms: 20 + -20 = 0 0 + -1.75r = 70 + -20 -1.75r = 70 + -20 Combine like terms: 70 + -20 = 50 -1.75r = 50 Divide each side by '-1.75'. r = -28.57142857 Simplifying r = -28.57142857
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