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Simplifying 18 + -12r = 13r + 18 Reorder the terms: 18 + -12r = 18 + 13r Add '-18' to each side of the equation. 18 + -18 + -12r = 18 + -18 + 13r Combine like terms: 18 + -18 = 0 0 + -12r = 18 + -18 + 13r -12r = 18 + -18 + 13r Combine like terms: 18 + -18 = 0 -12r = 0 + 13r -12r = 13r Solving -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. -12r + -13r = 13r + -13r Combine like terms: -12r + -13r = -25r -25r = 13r + -13r Combine like terms: 13r + -13r = 0 -25r = 0 Divide each side by '-25'. r = 0 Simplifying r = 0
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