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Simplifying 2r + -1(5 + -1) = 13 + 2r Combine like terms: 5 + -1 = 4 2r + -1(4) = 13 + 2r Multiply -1 * 4 2r + -4 = 13 + 2r Reorder the terms: -4 + 2r = 13 + 2r Add '-2r' to each side of the equation. -4 + 2r + -2r = 13 + 2r + -2r Combine like terms: 2r + -2r = 0 -4 + 0 = 13 + 2r + -2r -4 = 13 + 2r + -2r Combine like terms: 2r + -2r = 0 -4 = 13 + 0 -4 = 13 Solving -4 = 13 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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