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Simplifying 7 + 4u = 70 + -3u Solving 7 + 4u = 70 + -3u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '3u' to each side of the equation. 7 + 4u + 3u = 70 + -3u + 3u Combine like terms: 4u + 3u = 7u 7 + 7u = 70 + -3u + 3u Combine like terms: -3u + 3u = 0 7 + 7u = 70 + 0 7 + 7u = 70 Add '-7' to each side of the equation. 7 + -7 + 7u = 70 + -7 Combine like terms: 7 + -7 = 0 0 + 7u = 70 + -7 7u = 70 + -7 Combine like terms: 70 + -7 = 63 7u = 63 Divide each side by '7'. u = 9 Simplifying u = 9
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