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y in (-oo:+oo)
4 = (10*y)/8 // - (10*y)/8
4-((10*y)/8) = 0
(-5/4)*y+4 = 0
4-5/4*y = 0 // - 4
-5/4*y = -4 // : -5/4
y = -4/(-5/4)
y = 16/5
y = 16/5
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