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x in (-oo:+oo)
(1/5)*y+3 = 2*x+4 // - 2*x+4
(1/5)*y-(2*x)-4+3 = 0
(1/5)*y-2*x-4+3 = 0
1/5*y-2*x-1 = 0 // - 1/5*y-1
-2*x = -(1/5*y-1) // : -2
x = (-(1/5*y-1))/(-2)
x = (1-(1/5*y))/(-2)
x = (1-(1/5*y))/(-2)
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