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7 + 4u = 70 - 3u[add 3u to both sides]

7 + 4u + 3u = 70 - 3u + 3u

7 + 7u = 70 + 0

7 + 7u = 70

7u = 70 - 7

7u = 63

u = 9

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7y ago

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