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Simplifying 9r + -36 = 4r Reorder the terms: -36 + 9r = 4r Solving -36 + 9r = 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. -36 + 9r + -4r = 4r + -4r Combine like terms: 9r + -4r = 5r -36 + 5r = 4r + -4r Combine like terms: 4r + -4r = 0 -36 + 5r = 0 Add '36' to each side of the equation. -36 + 36 + 5r = 0 + 36 Combine like terms: -36 + 36 = 0 0 + 5r = 0 + 36 5r = 0 + 36 Combine like terms: 0 + 36 = 36 5r = 36 Divide each side by '5'. r = 7.2 Simplifying r = 7.2
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