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x in (-oo:+oo)
y = x/3-(3/10) // - x/3-(3/10)
y-(x/3)+3/10 = 0
y-1/3*x+3/10 = 0 // - y+3/10
-1/3*x = -(y+3/10) // : -1/3
x = (-(y+3/10))/(-1/3)
x = 3*(y+3/10)
x = 3*(y+3/10)
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