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u in (-oo:+oo)
7 = 3*u+6*u-(8/5)-(7/7) // - 3*u+6*u-(8/5)-(7/7)
8/5-(3*u)-(6*u)+7/7+7 = 0
8/5-3*u-6*u+7/7+7 = 0
48/5-9*u = 0 // - 48/5
-9*u = -48/5 // : -9
u = -48/5/(-9)
u = 16/15
u = 16/15
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