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Simplifying 12 + -6r + 3r + -4 = 0 Reorder the terms: 12 + -4 + -6r + 3r = 0 Combine like terms: 12 + -4 = 8 8 + -6r + 3r = 0 Combine like terms: -6r + 3r = -3r 8 + -3r = 0 Solving 8 + -3r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -3r = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -3r = 0 + -8 -3r = 0 + -8 Combine like terms: 0 + -8 = -8 -3r = -8 Divide each side by '-3'. r = 2.666666667 Simplifying r = 2.666666667
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