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Simplifying 3 = 4r + -9 Reorder the terms: 3 = -9 + 4r Solving 3 = -9 + 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. 3 + -4r = -9 + 4r + -4r Combine like terms: 4r + -4r = 0 3 + -4r = -9 + 0 3 + -4r = -9 Add '-3' to each side of the equation. 3 + -3 + -4r = -9 + -3 Combine like terms: 3 + -3 = 0 0 + -4r = -9 + -3 -4r = -9 + -3 Combine like terms: -9 + -3 = -12 -4r = -12 Divide each side by '-4'. r = 3 Simplifying r = 3
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