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x in (-oo:+oo)
Y+1 = (-3/4)*(x+7) // - (-3/4)*(x+7)
Y-((-3/4)*(x+7))+1 = 0
(3/4)*(x+7)+Y+1 = 0
3/4*(x+7)+Y+1 = 0
3/4*(x+7)+Y+1 = 0
Y+3/4*x+1+21/4 = 0
Y+3/4*x+25/4 = 0
Y+3/4*x+25/4 = 0
Y+3/4*x+25/4 = 0 // - Y+25/4
3/4*x = -(Y+25/4) // : 3/4
x = (-(Y+25/4))/3/4
x = -4/3*(Y+25/4)
x = -4/3*(Y+25/4)
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