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y in (-oo:+oo)
-3*y = (4*(y-1))/5 // - (4*(y-1))/5
-((4*(y-1))/5)-3*y = 0
(-4/5)*(y-1)-3*y = 0
-4/5*(y-1)-3*y = 0
-4/5*(y-1)-3*y = 0
4/5-19/5*y = 0
4/5-19/5*y = 0
4/5-19/5*y = 0 // - 4/5
-19/5*y = -4/5 // : -19/5
y = -4/5/(-19/5)
y = 4/19
y = 4/19
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