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