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y in (-oo:+oo)
-((7*y)/4)-4/5 = 0
(-7/4)*y-4/5 = 0
-7/4*y-4/5 = 0 // + 4/5
-7/4*y = 4/5 // : -7/4
y = 4/5/(-7/4)
y = -16/35
y = -16/35
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