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Simplifying -3r + 12 = r + 8 + -4r Reorder the terms: 12 + -3r = r + 8 + -4r Reorder the terms: 12 + -3r = 8 + r + -4r Combine like terms: r + -4r = -3r 12 + -3r = 8 + -3r Add '3r' to each side of the equation. 12 + -3r + 3r = 8 + -3r + 3r Combine like terms: -3r + 3r = 0 12 + 0 = 8 + -3r + 3r 12 = 8 + -3r + 3r Combine like terms: -3r + 3r = 0 12 = 8 + 0 12 = 8 Solving 12 = 8 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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