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Simplifying 12r + -12 = 13r + 18 Reorder the terms: -12 + 12r = 13r + 18 Reorder the terms: -12 + 12r = 18 + 13r Solving -12 + 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. -12 + 12r + -13r = 18 + 13r + -13r Combine like terms: 12r + -13r = -1r -12 + -1r = 18 + 13r + -13r Combine like terms: 13r + -13r = 0 -12 + -1r = 18 + 0 -12 + -1r = 18 Add '12' to each side of the equation. -12 + 12 + -1r = 18 + 12 Combine like terms: -12 + 12 = 0 0 + -1r = 18 + 12 -1r = 18 + 12 Combine like terms: 18 + 12 = 30 -1r = 30 Divide each side by '-1'. r = -30 Simplifying r = -30
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