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x in (-oo:+oo)
Y = (7/3)*x-4 // - (7/3)*x-4
Y-((7/3)*x)+4 = 0
Y+(-7/3)*x+4 = 0
Y-7/3*x+4 = 0 // - Y+4
-7/3*x = -(Y+4) // : -7/3
x = (-(Y+4))/(-7/3)
x = 3/7*(Y+4)
x = 3/7*(Y+4)
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