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Simplifying 7 = 3(u + -3) + -7u Reorder the terms: 7 = 3(-3 + u) + -7u 7 = (-3 * 3 + u * 3) + -7u 7 = (-9 + 3u) + -7u Combine like terms: 3u + -7u = -4u 7 = -9 + -4u Solving 7 = -9 + -4u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '4u' to each side of the equation. 7 + 4u = -9 + -4u + 4u Combine like terms: -4u + 4u = 0 7 + 4u = -9 + 0 7 + 4u = -9 Add '-7' to each side of the equation. 7 + -7 + 4u = -9 + -7 Combine like terms: 7 + -7 = 0 0 + 4u = -9 + -7 4u = -9 + -7 Combine like terms: -9 + -7 = -16 4u = -16 Divide each side by '4'. u = -4 Simplifying u = -4
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