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Simplifying 12r + -18 = 3r + 18 Reorder the terms: -18 + 12r = 3r + 18 Reorder the terms: -18 + 12r = 18 + 3r Solving -18 + 12r = 18 + 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. -18 + 12r + -3r = 18 + 3r + -3r Combine like terms: 12r + -3r = 9r -18 + 9r = 18 + 3r + -3r Combine like terms: 3r + -3r = 0 -18 + 9r = 18 + 0 -18 + 9r = 18 Add '18' to each side of the equation. -18 + 18 + 9r = 18 + 18 Combine like terms: -18 + 18 = 0 0 + 9r = 18 + 18 9r = 18 + 18 Combine like terms: 18 + 18 = 36 9r = 36 Divide each side by '9'. r = 4 Simplifying r = 4
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