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y in (-oo:+oo)
(1/2)*(7*y-4)+y = 3*y-((1/2)*(6-(5*y))) // - 3*y-((1/2)*(6-(5*y)))
(1/2)*(7*y-4)+(1/2)*(6-(5*y))+y-(3*y) = 0
(1/2)*(7*y-4)+(1/2)*(6-5*y)+y-3*y = 0
1/2*(7*y-4)+1/2*(6-5*y)+y-3*y = 0
1/2*(7*y-4)+1/2*(6-5*y)+y-3*y = 0
y+y-3*y+1 = 0
2*y-3*y+1 = 0
1-y = 0
1-y = 0
1-y = 0 // - 1
-y = -1 // * -1
y = 1
y = 1
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