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x in (-oo:+oo)
(3*x-7)/(-1) = y // - y
(3*x-7)/(-1)-y = 0
7-(3*x)-y = 0
7-3*x-y = 0 // - 7-y
-3*x = -(7-y) // : -3
x = (-(7-y))/(-3)
x = (y-7)/(-3)
x = (y-7)/(-3)
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