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x in (-oo:+oo)
y = (3/8)*x-(3/2) // - (3/8)*x-(3/2)
y-((3/8)*x)+3/2 = 0
(-3/8)*x+y+3/2 = 0
y-3/8*x+3/2 = 0 // - y+3/2
-3/8*x = -(y+3/2) // : -3/8
x = (-(y+3/2))/(-3/8)
x = 8/3*(y+3/2)
x = 8/3*(y+3/2)
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