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y in (-oo:+oo)
y/2 = (3*y)/4-40 // - (3*y)/4-40
y/2-((3*y)/4)+40 = 0
y/2+(-3/4)*y+40 = 0
40-1/4*y = 0 // - 40
-1/4*y = -40 // : -1/4
y = -40/(-1/4)
y = 160
y = 160
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