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y in (-oo:+oo)
(-3*y)/4-(3/3) = y/3 // - y/3
(-3*y)/4-(y/3)-(3/3) = 0
(-3*y)/4-(y/3)-1 = 0
-13/12*y-1 = 0 // + 1
-13/12*y = 1 // : -13/12
y = 1/(-13/12)
y = -12/13
y = -12/13
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