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y in (-oo:+oo)
(y^1)/2-((19*y^1)/4)+90 = 0
y/2+(-19/4)*y+90 = 0
90-17/4*y = 0 // - 90
-17/4*y = -90 // : -17/4
y = -90/(-17/4)
y = 360/17
y = 360/17
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