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x in (-oo:+oo)
y = 3*x-(13/7) // - 3*x-(13/7)
y-(3*x)+13/7 = 0
y-3*x+13/7 = 0
y-3*x+13/7 = 0 // - y+13/7
-3*x = -(y+13/7) // : -3
x = (-(y+13/7))/(-3)
x = (y+13/7)/3
x = (y+13/7)/3
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