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x in (-oo:+oo)
y = (1/20)*x+6 // - (1/20)*x+6
y-((1/20)*x)-6 = 0
(-1/20)*x+y-6 = 0
y-1/20*x-6 = 0 // - y-6
-1/20*x = -(y-6) // : -1/20
x = (-(y-6))/(-1/20)
x = -20*(6-y)
x = -20*(6-y)
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