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x in (-oo:+oo)
x = 3*y-y-(8/2) // - 3*y-y-(8/2)
x-(3*y)+y+8/2 = 0
x-3*y+y+8/2 = 0
x-2*y+4 = 0 // - 4-2*y
x = -(4-2*y)
x = -(4-2*y)
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