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