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Simplifying 8 + -1r + -5r = -12 + -1r Combine like terms: -1r + -5r = -6r 8 + -6r = -12 + -1r Solving 8 + -6r = -12 + -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. 8 + -6r + r = -12 + -1r + r Combine like terms: -6r + r = -5r 8 + -5r = -12 + -1r + r Combine like terms: -1r + r = 0 8 + -5r = -12 + 0 8 + -5r = -12 Add '-8' to each side of the equation. 8 + -8 + -5r = -12 + -8 Combine like terms: 8 + -8 = 0 0 + -5r = -12 + -8 -5r = -12 + -8 Combine like terms: -12 + -8 = -20 -5r = -20 Divide each side by '-5'. r = 4 Simplifying r = 4
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