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