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Simplifying -1r + 12 = 4r + -18 Reorder the terms: 12 + -1r = 4r + -18 Reorder the terms: 12 + -1r = -18 + 4r Solving 12 + -1r = -18 + 4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4r' to each side of the equation. 12 + -1r + -4r = -18 + 4r + -4r Combine like terms: -1r + -4r = -5r 12 + -5r = -18 + 4r + -4r Combine like terms: 4r + -4r = 0 12 + -5r = -18 + 0 12 + -5r = -18 Add '-12' to each side of the equation. 12 + -12 + -5r = -18 + -12 Combine like terms: 12 + -12 = 0 0 + -5r = -18 + -12 -5r = -18 + -12 Combine like terms: -18 + -12 = -30 -5r = -30 Divide each side by '-5'. r = 6 Simplifying r = 6
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