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Simplifying -9 + 12r = -3r Solving -9 + 12r = -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. -9 + 12r + 3r = -3r + 3r Combine like terms: 12r + 3r = 15r -9 + 15r = -3r + 3r Combine like terms: -3r + 3r = 0 -9 + 15r = 0 Add '9' to each side of the equation. -9 + 9 + 15r = 0 + 9 Combine like terms: -9 + 9 = 0 0 + 15r = 0 + 9 15r = 0 + 9 Combine like terms: 0 + 9 = 9 15r = 9 Divide each side by '15'. r = 0.6 Simplifying r = 0.6
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