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Simplifying 9 + -3r = r + -1 Reorder the terms: 9 + -3r = -1 + r Solving 9 + -3r = -1 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 9 + -3r + -1r = -1 + r + -1r Combine like terms: -3r + -1r = -4r 9 + -4r = -1 + r + -1r Combine like terms: r + -1r = 0 9 + -4r = -1 + 0 9 + -4r = -1 Add '-9' to each side of the equation. 9 + -9 + -4r = -1 + -9 Combine like terms: 9 + -9 = 0 0 + -4r = -1 + -9 -4r = -1 + -9 Combine like terms: -1 + -9 = -10 -4r = -10 Divide each side by '-4'. r = 2.5 Simplifying r = 2.5
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