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Simplifying 13 + -2(4r + -5) = 5 + -1(7 + 8r) Reorder the terms: 13 + -2(-5 + 4r) = 5 + -1(7 + 8r) 13 + (-5 * -2 + 4r * -2) = 5 + -1(7 + 8r) 13 + (10 + -8r) = 5 + -1(7 + 8r) Combine like terms: 13 + 10 = 23 23 + -8r = 5 + -1(7 + 8r) 23 + -8r = 5 + (7 * -1 + 8r * -1) 23 + -8r = 5 + (-7 + -8r) Combine like terms: 5 + -7 = -2 23 + -8r = -2 + -8r Add '8r' to each side of the equation. 23 + -8r + 8r = -2 + -8r + 8r Combine like terms: -8r + 8r = 0 23 + 0 = -2 + -8r + 8r 23 = -2 + -8r + 8r Combine like terms: -8r + 8r = 0 23 = -2 + 0 23 = -2 Solving 23 = -2 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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