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u in (-oo:+oo)
(1/5)*(3*u-4)-(2*u)-8 = -30 // + 30
(1/5)*(3*u-4)-(2*u)-8+30 = 0
(1/5)*(3*u-4)-2*u-8+30 = 0
1/5*(3*u-4)-2*u-8+30 = 0
1/5*(3*u-4)-2*u-8+30 = 0
30-7/5*u-8-4/5 = 0
30-7/5*u-44/5 = 0
106/5-7/5*u = 0
106/5-7/5*u = 0
106/5-7/5*u = 0 // - 106/5
-7/5*u = -106/5 // : -7/5
u = -106/5/(-7/5)
u = 106/7
u = 106/7
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