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y in (-oo:+oo)
3*((1/2)*y+1)+(3/4)*y = 4*y-4 // - 4*y-4
3*((1/2)*y+1)+(3/4)*y-(4*y)+4 = 0
3*((1/2)*y+1)+(3/4)*y-4*y+4 = 0
3*(1/2*y+1)+(3*y)/4-4*y+4 = 0
(3*4*(1/2*y+1))/4+(3*y)/4+(-4*4*y)/4+(4^2)/4 = 0
3*4*(1/2*y+1)+3*y-4*4*y+16 = 0
9*y-16*y+12+16 = 0
12-7*y+16 = 0
28-7*y = 0
(28-7*y)/4 = 0
(28-7*y)/4 = 0 // * 4
28-7*y = 0
28-7*y = 0 // - 28
-7*y = -28 // : -7
y = -28/(-7)
y = 4
y = 4
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