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y in (-oo:+oo)
0.22*y-0.4 = (0.22*y)/2-(0.5*y) // - (0.22*y)/2-(0.5*y)
0.22*y-((0.22*y)/2)+0.5*y-0.4 = 0
0.22*y-0.11*y+0.5*y-0.4 = 0
0.61*y-0.4 = 0 // + 0.4
0.61*y = 0.4 // : 0.61
y = 0.4/0.61
y = 0.6557377
y = 0.6557377
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