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Simplifying 138.75 = 9.25(-6 + r) 138.75 = (-6 * 9.25 + r * 9.25) 138.75 = (-55.5 + 9.25r) Solving 138.75 = -55.5 + 9.25r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9.25r' to each side of the equation. 138.75 + -9.25r = -55.5 + 9.25r + -9.25r Combine like terms: 9.25r + -9.25r = 0.00 138.75 + -9.25r = -55.5 + 0.00 138.75 + -9.25r = -55.5 Add '-138.75' to each side of the equation. 138.75 + -138.75 + -9.25r = -55.5 + -138.75 Combine like terms: 138.75 + -138.75 = 0.00 0.00 + -9.25r = -55.5 + -138.75 -9.25r = -55.5 + -138.75 Combine like terms: -55.5 + -138.75 = -194.25 -9.25r = -194.25 Divide each side by '-9.25'. r = 21 Simplifying r = 21
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