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x in (-oo:+oo)
y/3 = x/2-(5/2) // - x/2-(5/2)
y/3-(x/2)+5/2 = 0
1/3*y-1/2*x+5/2 = 0 // - 1/3*y+5/2
-1/2*x = -(1/3*y+5/2) // : -1/2
x = (-(1/3*y+5/2))/(-1/2)
x = 2*(1/3*y+5/2)
x = 2*(1/3*y+5/2)
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