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Simplifying 5 + 8r + -4r = 6r + 21 + -2r Combine like terms: 8r + -4r = 4r 5 + 4r = 6r + 21 + -2r Reorder the terms: 5 + 4r = 21 + 6r + -2r Combine like terms: 6r + -2r = 4r 5 + 4r = 21 + 4r Add '-4r' to each side of the equation. 5 + 4r + -4r = 21 + 4r + -4r Combine like terms: 4r + -4r = 0 5 + 0 = 21 + 4r + -4r 5 = 21 + 4r + -4r Combine like terms: 4r + -4r = 0 5 = 21 + 0 5 = 21 Solving 5 = 21 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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