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Simplifying 3r + 9(r + -2) = 7 Reorder the terms: 3r + 9(-2 + r) = 7 3r + (-2 * 9 + r * 9) = 7 3r + (-18 + 9r) = 7 Reorder the terms: -18 + 3r + 9r = 7 Combine like terms: 3r + 9r = 12r -18 + 12r = 7 Solving -18 + 12r = 7 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + 12r = 7 + 18 Combine like terms: -18 + 18 = 0 0 + 12r = 7 + 18 12r = 7 + 18 Combine like terms: 7 + 18 = 25 12r = 25 Divide each side by '12'. r = 2.083333333 Simplifying r = 2.083333333
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