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x in (-oo:+oo)
y = -((5/9)*x)-6 // + -((5/9)*x)-6
(5/9)*x+y+6 = 0
5/9*x+y+6 = 0 // - y+6
5/9*x = -(y+6) // : 5/9
x = (-(y+6))/5/9
x = -9/5*(y+6)
x = -9/5*(y+6)
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