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Simplifying 3r + 18 + -5r = -12 Reorder the terms: 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 = -30 -2r = -30 Divide each side by '-2'. r = 15 Simplifying r = 15
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