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Simplifying 2r + -1(5 + -7) = 13 + 2r Combine like terms: 5 + -7 = -2 2r + -1(-2) = 13 + 2r Multiply -1 * -2 2r + 2 = 13 + 2r Reorder the terms: 2 + 2r = 13 + 2r Add '-2r' to each side of the equation. 2 + 2r + -2r = 13 + 2r + -2r Combine like terms: 2r + -2r = 0 2 + 0 = 13 + 2r + -2r 2 = 13 + 2r + -2r Combine like terms: 2r + -2r = 0 2 = 13 + 0 2 = 13 Solving 2 = 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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