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y in (-oo:+oo)
y-(4/8) = y/2-10 // - y/2-10
y-(y/2)-(4/8)+10 = 0
y-(y/2)-1/2+10 = 0
1/2*y+19/2 = 0 // - 19/2
1/2*y = -19/2 // : 1/2
y = -19/2/1/2
y = -19
y = -19
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