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y in (-oo:+oo)
(1/2)*(y-8) = (1/4)*y-2 // - (1/4)*y-2
(1/2)*(y-8)-((1/4)*y)+2 = 0
(1/2)*(y-8)+(-1/4)*y+2 = 0
1/2*(y-8)-y/4+2 = 0
(1/2*4*(y-8))/4-y/4+(2*4)/4 = 0
1/2*4*(y-8)-y+2*4 = 0
y-16+8 = 0
y-8 = 0
(y-8)/4 = 0
(y-8)/4 = 0 // * 4
y-8 = 0
y-8 = 0 // + 8
y = 8
y = 8
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