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x in (-oo:+oo)
y = 3*x+(5/8)*x+4 // - 3*x+(5/8)*x+4
y-(3*x)-((5/8)*x)-4 = 0
(-5/8)*x-3*x+y-4 = 0
y-29/8*x-4 = 0 // - y-4
-29/8*x = -(y-4) // : -29/8
x = (-(y-4))/(-29/8)
x = -8/29*(4-y)
x = -8/29*(4-y)
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