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Simplifying 9 + -1r = -3r + -1r Combine like terms: -3r + -1r = -4r 9 + -1r = -4r Solving 9 + -1r = -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 + -1r + 4r = -4r + 4r Combine like terms: -1r + 4r = 3r 9 + 3r = -4r + 4r Combine like terms: -4r + 4r = 0 9 + 3r = 0 Add '-9' to each side of the equation. 9 + -9 + 3r = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 3r = 0 + -9 3r = 0 + -9 Combine like terms: 0 + -9 = -9 3r = -9 Divide each side by '3'. r = -3 Simplifying r = -3
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