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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If I am correct, 9 plus 7 equals 112.
35
9 plus 7 equals 144. Generally, x plus y = x(x+y).
2n plus 7 equals 19 2n equals 12 n equals 6