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y in (-oo:+oo)
2*(8-((9*y)/4)) = 0
2*((-9/4)*y+8) = 0
2*(8-9/4*y) = 0
8-9/4*y = 0 // - 8
-9/4*y = -8 // : -9/4
y = -8/(-9/4)
y = 32/9
y = 32/9
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