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Simplifying 12r + -3 = 9r + 9 Reorder the terms: -3 + 12r = 9r + 9 Reorder the terms: -3 + 12r = 9 + 9r Solving -3 + 12r = 9 + 9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9r' to each side of the equation. -3 + 12r + -9r = 9 + 9r + -9r Combine like terms: 12r + -9r = 3r -3 + 3r = 9 + 9r + -9r Combine like terms: 9r + -9r = 0 -3 + 3r = 9 + 0 -3 + 3r = 9 Add '3' to each side of the equation. -3 + 3 + 3r = 9 + 3 Combine like terms: -3 + 3 = 0 0 + 3r = 9 + 3 3r = 9 + 3 Combine like terms: 9 + 3 = 12 3r = 12 Divide each side by '3'. r = 4 Simplifying r = 4
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