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x in (-oo:+oo)
Y = (7/4)*x-6 // - (7/4)*x-6
Y-((7/4)*x)+6 = 0
Y+(-7/4)*x+6 = 0
Y-7/4*x+6 = 0 // - Y+6
-7/4*x = -(Y+6) // : -7/4
x = (-(Y+6))/(-7/4)
x = 4/7*(Y+6)
x = 4/7*(Y+6)
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