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Simplifying 3(r + 6) + -5r = 12 Reorder the terms: 3(6 + r) + -5r = 12 (6 * 3 + r * 3) + -5r = 12 (18 + 3r) + -5r = 12 Combine like terms: 3r + -5r = -2r 18 + -2r = 12 Solving 18 + -2r = 12 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 + -2r = 12 + -18 Combine like terms: 18 + -18 = 0 0 + -2r = 12 + -18 -2r = 12 + -18 Combine like terms: 12 + -18 = -6 -2r = -6 Divide each side by '-2'. r = 3 Simplifying r = 3
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