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Simplifying 12r + -18 = 13r Reorder the terms: -18 + 12r = 13r Solving -18 + 12r = 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 = 13r + -13r Combine like terms: 12r + -13r = -1r -18 + -1r = 13r + -13r Combine like terms: 13r + -13r = 0 -18 + -1r = 0 Add '18' to each side of the equation. -18 + 18 + -1r = 0 + 18 Combine like terms: -18 + 18 = 0 0 + -1r = 0 + 18 -1r = 0 + 18 Combine like terms: 0 + 18 = 18 -1r = 18 Divide each side by '-1'. r = -18 Simplifying r = -18
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