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Simplifying 3r + 9r + (12 + -2r) = 2 Remove parenthesis around (12 + -2r) 3r + 9r + 12 + -2r = 2 Reorder the terms: 12 + 3r + 9r + -2r = 2 Combine like terms: 3r + 9r = 12r 12 + 12r + -2r = 2 Combine like terms: 12r + -2r = 10r 12 + 10r = 2 Solving 12 + 10r = 2 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 10r = 2 + -12 Combine like terms: 12 + -12 = 0 0 + 10r = 2 + -12 10r = 2 + -12 Combine like terms: 2 + -12 = -10 10r = -10 Divide each side by '10'. r = -1 Simplifying r = -1
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