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Simplifying 5 + -3r + -1(18 + -7r) = 4(r + 7) 5 + -3r + (18 * -1 + -7r * -1) = 4(r + 7) 5 + -3r + (-18 + 7r) = 4(r + 7) Reorder the terms: 5 + -18 + -3r + 7r = 4(r + 7) Combine like terms: 5 + -18 = -13 -13 + -3r + 7r = 4(r + 7) Combine like terms: -3r + 7r = 4r -13 + 4r = 4(r + 7) Reorder the terms: -13 + 4r = 4(7 + r) -13 + 4r = (7 * 4 + r * 4) -13 + 4r = (28 + 4r) Add '-4r' to each side of the equation. -13 + 4r + -4r = 28 + 4r + -4r Combine like terms: 4r + -4r = 0 -13 + 0 = 28 + 4r + -4r -13 = 28 + 4r + -4r Combine like terms: 4r + -4r = 0 -13 = 28 + 0 -13 = 28 Solving -13 = 28 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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