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