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Simplifying r + -12 = -2r Reorder the terms: -12 + r = -2r Solving -12 + r = -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. -12 + r + 2r = -2r + 2r Combine like terms: r + 2r = 3r -12 + 3r = -2r + 2r Combine like terms: -2r + 2r = 0 -12 + 3r = 0 Add '12' to each side of the equation. -12 + 12 + 3r = 0 + 12 Combine like terms: -12 + 12 = 0 0 + 3r = 0 + 12 3r = 0 + 12 Combine like terms: 0 + 12 = 12 3r = 12 Divide each side by '3'. r = 4 Simplifying r = 4
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