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y in (-oo:+oo)
(-3/4)*y-(1/2) = 4/5 // - 4/5
(-3/4)*y-(1/2)-(4/5) = 0
(-3/4)*y-1/2-4/5 = 0
-3/4*y-13/10 = 0 // + 13/10
-3/4*y = 13/10 // : -3/4
y = 13/10/(-3/4)
y = -26/15
y = -26/15
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