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u in (-oo:+oo)
u/0.3 = 4*u+6.28 // - 4*u+6.28
u/0.3-(4*u)-6.28 = 0
u/0.3-4*u-6.28 = 0
-0.66666667*u-6.28 = 0 // + 6.28
-0.66666667*u = 6.28 // : -0.66666667
u = 6.28/(-0.66666667)
u = -9.41999995
u = -9.41999995
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