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D( u )
4-(3*u) = 0
4-(3*u) = 0
4-(3*u) = 0
4-3*u = 0
4-3*u = 0 // - 4
-3*u = -4 // : -3
u = -4/(-3)
u = 4/3
u in (-oo:4/3) U (4/3:+oo)
abs(-(4*u)-4)/(4-(3*u)) = 0
abs(-4*u-4)/(4-3*u) = 0
abs(-4*u-4)/(4-3*u) = 0
u in (-oo:+oo)
abs(-4*u-4)
-4*u-4 >= 0
-4*u-4 >= 0 // + 4
-4*u >= 4 // : -4
u <= 4/(-4)
u <= -1
u in (-oo:-1>
(-4*u-4)/(4-3*u) = 0
u in (-1:+oo)
(-(-4*u-4))/(4-3*u) = 0
abs(-4*u-4)/(4-3*u) = 0
/ | (-(-4*u-4))/(4-3*u) = 0 i u in (-1:+oo) | (-4*u-4)/(4-3*u) = 0 i u in (-oo:-1>
u in (-1:+oo)
(-(-4*u-4))/(4-3*u) = 0
(4*u+4)/(4-3*u) = 0
4*u+4 = 0 // - 4
4*u = -4 // : 4
u = -4/4
u = -1
(-1:+oo)
u in (-oo:-1>
(-4*u-4)/(4-3*u) = 0
-4*u-4 = 0 // + 4
-4*u = 4 // : -4
u = 4/(-4)
u = -1
u = -1
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