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Simplifying 12 + 3r + -5r = 6r + -8r + -4 Combine like terms: 3r + -5r = -2r 12 + -2r = 6r + -8r + -4 Reorder the terms: 12 + -2r = -4 + 6r + -8r Combine like terms: 6r + -8r = -2r 12 + -2r = -4 + -2r Add '2r' to each side of the equation. 12 + -2r + 2r = -4 + -2r + 2r Combine like terms: -2r + 2r = 0 12 + 0 = -4 + -2r + 2r 12 = -4 + -2r + 2r Combine like terms: -2r + 2r = 0 12 = -4 + 0 12 = -4 Solving 12 = -4 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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