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Simplifying 12 = 4r + -8 + 6r Reorder the terms: 12 = -8 + 4r + 6r Combine like terms: 4r + 6r = 10r 12 = -8 + 10r Solving 12 = -8 + 10r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-10r' to each side of the equation. 12 + -10r = -8 + 10r + -10r Combine like terms: 10r + -10r = 0 12 + -10r = -8 + 0 12 + -10r = -8 Add '-12' to each side of the equation. 12 + -12 + -10r = -8 + -12 Combine like terms: 12 + -12 = 0 0 + -10r = -8 + -12 -10r = -8 + -12 Combine like terms: -8 + -12 = -20 -10r = -20 Divide each side by '-10'. r = 2 Simplifying r = 2
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