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x in (-oo:+oo)
(3/(-7))*x+y+3*y = 11 // - 11
(3/(-7))*x+y+3*y-11 = 0
4*y-3/7*x-11 = 0 // - 4*y-11
-3/7*x = -(4*y-11) // : -3/7
x = (-(4*y-11))/(-3/7)
x = -7/3*(11-(4*y))
x = -7/3*(11-(4*y))
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