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x in (-oo:+oo)
(15/6)*y-7*x = 1-x // - 1-x
x-7*x+(15/6)*y-1 = 0
5/2*y-6*x-1 = 0 // - 5/2*y-1
-6*x = -(5/2*y-1) // : -6
x = (-(5/2*y-1))/(-6)
x = (1-(5/2*y))/(-6)
x = (1-(5/2*y))/(-6)
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