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x in (-oo:+oo)
Y = (1/7)*x-6 // - (1/7)*x-6
Y-((1/7)*x)+6 = 0
Y+(-1/7)*x+6 = 0
Y-1/7*x+6 = 0 // - Y+6
-1/7*x = -(Y+6) // : -1/7
x = (-(Y+6))/(-1/7)
x = 7*(Y+6)
x = 7*(Y+6)
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