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x in (-oo:+oo)
y+2/7 = 3*x // - 3*x
y-(3*x)+2/7 = 0
y-3*x+2/7 = 0
y-3*x+2/7 = 0 // - y+2/7
-3*x = -(y+2/7) // : -3
x = (-(y+2/7))/(-3)
x = (y+2/7)/3
x = (y+2/7)/3
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