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Simplifying -12 + -2r = r + -9 Reorder the terms: -12 + -2r = -9 + r Solving -12 + -2r = -9 + 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. -12 + -2r + -1r = -9 + r + -1r Combine like terms: -2r + -1r = -3r -12 + -3r = -9 + r + -1r Combine like terms: r + -1r = 0 -12 + -3r = -9 + 0 -12 + -3r = -9 Add '12' to each side of the equation. -12 + 12 + -3r = -9 + 12 Combine like terms: -12 + 12 = 0 0 + -3r = -9 + 12 -3r = -9 + 12 Combine like terms: -9 + 12 = 3 -3r = 3 Divide each side by '-3'. r = -1 Simplifying r = -1
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