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Simplifying 12r + -8 = 13r + 18 Reorder the terms: -8 + 12r = 13r + 18 Reorder the terms: -8 + 12r = 18 + 13r Solving -8 + 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. -8 + 12r + -13r = 18 + 13r + -13r Combine like terms: 12r + -13r = -1r -8 + -1r = 18 + 13r + -13r Combine like terms: 13r + -13r = 0 -8 + -1r = 18 + 0 -8 + -1r = 18 Add '8' to each side of the equation. -8 + 8 + -1r = 18 + 8 Combine like terms: -8 + 8 = 0 0 + -1r = 18 + 8 -1r = 18 + 8 Combine like terms: 18 + 8 = 26 -1r = 26 Divide each side by '-1'. r = -26 Simplifying r = -26
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