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