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Simplifying 7u + -1(3u + 1) = 4(3 + u) Reorder the terms: 7u + -1(1 + 3u) = 4(3 + u) 7u + (1 * -1 + 3u * -1) = 4(3 + u) 7u + (-1 + -3u) = 4(3 + u) Reorder the terms: -1 + 7u + -3u = 4(3 + u) Combine like terms: 7u + -3u = 4u -1 + 4u = 4(3 + u) -1 + 4u = (3 * 4 + u * 4) -1 + 4u = (12 + 4u) Add '-4u' to each side of the equation. -1 + 4u + -4u = 12 + 4u + -4u Combine like terms: 4u + -4u = 0 -1 + 0 = 12 + 4u + -4u -1 = 12 + 4u + -4u Combine like terms: 4u + -4u = 0 -1 = 12 + 0 -1 = 12 Solving -1 = 12 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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