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Simplifying 12 + -2r = 3 + -3r Solving 12 + -2r = 3 + -3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3r' to each side of the equation. 12 + -2r + 3r = 3 + -3r + 3r Combine like terms: -2r + 3r = 1r 12 + 1r = 3 + -3r + 3r Combine like terms: -3r + 3r = 0 12 + 1r = 3 + 0 12 + 1r = 3 Add '-12' to each side of the equation. 12 + -12 + 1r = 3 + -12 Combine like terms: 12 + -12 = 0 0 + 1r = 3 + -12 1r = 3 + -12 Combine like terms: 3 + -12 = -9 1r = -9 Divide each side by '1'. r = -9 Simplifying r = -9
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