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Simplifying -12 = 8r + -5r Combine like terms: 8r + -5r = 3r -12 = 3r Solving -12 = 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 + -3r = 3r + -3r Combine like terms: 3r + -3r = 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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