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x in (-oo:+oo)
Y+9 = (3/4)*(x-4) // - (3/4)*(x-4)
Y-((3/4)*(x-4))+9 = 0
(-3/4)*(x-4)+Y+9 = 0
Y-3/4*(x-4)+9 = 0
Y-3/4*(x-4)+9 = 0
Y-3/4*x+3+9 = 0
Y-3/4*x+12 = 0
Y-3/4*x+12 = 0
Y-3/4*x+12 = 0 // - Y+12
-3/4*x = -(Y+12) // : -3/4
x = (-(Y+12))/(-3/4)
x = 4/3*(Y+12)
x = 4/3*(Y+12)
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