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y in (-oo:+oo)
3-((5*y)/4) = 8 // - 8
3-((5*y)/4)-8 = 0
(-5/4)*y-8+3 = 0
-5/4*y-5 = 0 // + 5
-5/4*y = 5 // : -5/4
y = 5/(-5/4)
y = -4
y = -4
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