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Simplifying 13r + 18 = 12r + -18 Reorder the terms: 18 + 13r = 12r + -18 Reorder the terms: 18 + 13r = -18 + 12r Solving 18 + 13r = -18 + 12r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12r' to each side of the equation. 18 + 13r + -12r = -18 + 12r + -12r Combine like terms: 13r + -12r = 1r 18 + 1r = -18 + 12r + -12r Combine like terms: 12r + -12r = 0 18 + 1r = -18 + 0 18 + 1r = -18 Add '-18' to each side of the equation. 18 + -18 + 1r = -18 + -18 Combine like terms: 18 + -18 = 0 0 + 1r = -18 + -18 1r = -18 + -18 Combine like terms: -18 + -18 = -36 1r = -36 Divide each side by '1'. r = -36 Simplifying r = -36
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