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x in (-oo:+oo)
Y = (3/7)*x-12 // - (3/7)*x-12
Y-((3/7)*x)+12 = 0
Y+(-3/7)*x+12 = 0
Y-3/7*x+12 = 0 // - Y+12
-3/7*x = -(Y+12) // : -3/7
x = (-(Y+12))/(-3/7)
x = 7/3*(Y+12)
x = 7/3*(Y+12)
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