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Simplifying 9r + -45 = 4r + 20 Reorder the terms: -45 + 9r = 4r + 20 Reorder the terms: -45 + 9r = 20 + 4r Solving -45 + 9r = 20 + 4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4r' to each side of the equation. -45 + 9r + -4r = 20 + 4r + -4r Combine like terms: 9r + -4r = 5r -45 + 5r = 20 + 4r + -4r Combine like terms: 4r + -4r = 0 -45 + 5r = 20 + 0 -45 + 5r = 20 Add '45' to each side of the equation. -45 + 45 + 5r = 20 + 45 Combine like terms: -45 + 45 = 0 0 + 5r = 20 + 45 5r = 20 + 45 Combine like terms: 20 + 45 = 65 5r = 65 Divide each side by '5'. r = 13 Simplifying r = 13
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