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x in (-oo:+oo)
(5/3)*y+1 = 2*x+6 // - 2*x+6
(5/3)*y-(2*x)-6+1 = 0
(5/3)*y-2*x-6+1 = 0
5/3*y-2*x-5 = 0 // - 5/3*y-5
-2*x = -(5/3*y-5) // : -2
x = (-(5/3*y-5))/(-2)
x = (5-(5/3*y))/(-2)
x = (5-(5/3*y))/(-2)
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