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y in (-oo:+oo)
(10/4)*y+8/2 = 2*y-2 // - 2*y-2
(10/4)*y-(2*y)+8/2+2 = 0
(10/4)*y-2*y+8/2+2 = 0
1/2*y+6 = 0 // - 6
1/2*y = -6 // : 1/2
y = -6/1/2
y = -12
y = -12
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