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Simplifying 2 + -2r = 4r + -5r + 9 Reorder the terms: 2 + -2r = 9 + 4r + -5r Combine like terms: 4r + -5r = -1r 2 + -2r = 9 + -1r Solving 2 + -2r = 9 + -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. 2 + -2r + r = 9 + -1r + r Combine like terms: -2r + r = -1r 2 + -1r = 9 + -1r + r Combine like terms: -1r + r = 0 2 + -1r = 9 + 0 2 + -1r = 9 Add '-2' to each side of the equation. 2 + -2 + -1r = 9 + -2 Combine like terms: 2 + -2 = 0 0 + -1r = 9 + -2 -1r = 9 + -2 Combine like terms: 9 + -2 = 7 -1r = 7 Divide each side by '-1'. r = -7 Simplifying r = -7
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