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x in (-oo:+oo)
(1/6)*y = 2*x+13 // - 2*x+13
(1/6)*y-(2*x)-13 = 0
(1/6)*y-2*x-13 = 0
1/6*y-2*x-13 = 0 // - 1/6*y-13
-2*x = -(1/6*y-13) // : -2
x = (-(1/6*y-13))/(-2)
x = (13-(1/6*y))/(-2)
x = (13-(1/6*y))/(-2)
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