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Simplifying 7r + -6r + -15 + 5 + 3r = 4r + 20 Reorder the terms: -15 + 5 + 7r + -6r + 3r = 4r + 20 Combine like terms: -15 + 5 = -10 -10 + 7r + -6r + 3r = 4r + 20 Combine like terms: 7r + -6r = 1r -10 + 1r + 3r = 4r + 20 Combine like terms: 1r + 3r = 4r -10 + 4r = 4r + 20 Reorder the terms: -10 + 4r = 20 + 4r Add '-4r' to each side of the equation. -10 + 4r + -4r = 20 + 4r + -4r Combine like terms: 4r + -4r = 0 -10 + 0 = 20 + 4r + -4r -10 = 20 + 4r + -4r Combine like terms: 4r + -4r = 0 -10 = 20 + 0 -10 = 20 Solving -10 = 20 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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