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