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x in (-oo:+oo)
Y = (4/9)*x-14 // - (4/9)*x-14
Y-((4/9)*x)+14 = 0
Y+(-4/9)*x+14 = 0
Y-4/9*x+14 = 0 // - Y+14
-4/9*x = -(Y+14) // : -4/9
x = (-(Y+14))/(-4/9)
x = 9/4*(Y+14)
x = 9/4*(Y+14)
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