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u in (-oo:+oo)
u-4 = 7*(u/5-4) // - 7*(u/5-4)
u-(7*(u/5-4))-4 = 0
u-7*(u/5-4)-4 = 0
u-7*(1/5*u-4)-4 = 0
u-7*(1/5*u-4)-4 = 0
28-2/5*u-4 = 0
24-2/5*u = 0
24-2/5*u = 0
24-2/5*u = 0 // - 24
-2/5*u = -24 // : -2/5
u = -24/(-2/5)
u = 60
u = 60
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