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Simplifying 12r + -18 = (13r + 18) Reorder the terms: -18 + 12r = (13r + 18) Reorder the terms: -18 + 12r = (18 + 13r) Remove parenthesis around (18 + 13r) -18 + 12r = 18 + 13r Solving -18 + 12r = 18 + 13r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-13r' to each side of the equation. -18 + 12r + -13r = 18 + 13r + -13r Combine like terms: 12r + -13r = -1r -18 + -1r = 18 + 13r + -13r Combine like terms: 13r + -13r = 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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