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Simplifying 9 + -3r = 2r + -4 Reorder the terms: 9 + -3r = -4 + 2r Solving 9 + -3r = -4 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. 9 + -3r + -2r = -4 + 2r + -2r Combine like terms: -3r + -2r = -5r 9 + -5r = -4 + 2r + -2r Combine like terms: 2r + -2r = 0 9 + -5r = -4 + 0 9 + -5r = -4 Add '-9' to each side of the equation. 9 + -9 + -5r = -4 + -9 Combine like terms: 9 + -9 = 0 0 + -5r = -4 + -9 -5r = -4 + -9 Combine like terms: -4 + -9 = -13 -5r = -13 Divide each side by '-5'. r = 2.6 Simplifying r = 2.6
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