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x in (-oo:+oo)
y-2 = (3/8)*(x-4) // - (3/8)*(x-4)
y-((3/8)*(x-4))-2 = 0
(-3/8)*(x-4)+y-2 = 0
y-3/8*(x-4)-2 = 0
y-3/8*(x-4)-2 = 0
y-3/8*x-2+3/2 = 0
y-3/8*x-1/2 = 0
y-3/8*x-1/2 = 0
y-3/8*x-1/2 = 0 // - y-1/2
-3/8*x = -(y-1/2) // : -3/8
x = (-(y-1/2))/(-3/8)
x = -8/3*(1/2-y)
x = -8/3*(1/2-y)
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