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Simplifying 12r + -19 = -8r + 31 Reorder the terms: -19 + 12r = -8r + 31 Reorder the terms: -19 + 12r = 31 + -8r Solving -19 + 12r = 31 + -8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '8r' to each side of the equation. -19 + 12r + 8r = 31 + -8r + 8r Combine like terms: 12r + 8r = 20r -19 + 20r = 31 + -8r + 8r Combine like terms: -8r + 8r = 0 -19 + 20r = 31 + 0 -19 + 20r = 31 Add '19' to each side of the equation. -19 + 19 + 20r = 31 + 19 Combine like terms: -19 + 19 = 0 0 + 20r = 31 + 19 20r = 31 + 19 Combine like terms: 31 + 19 = 50 20r = 50 Divide each side by '20'. r = 2.5 Simplifying r = 2.5
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