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x in (-oo:+oo)
y-7 = (5/6)*(x-4) // - (5/6)*(x-4)
y-((5/6)*(x-4))-7 = 0
(-5/6)*(x-4)+y-7 = 0
y-5/6*(x-4)-7 = 0
y-5/6*(x-4)-7 = 0
y-5/6*x-7+10/3 = 0
y-5/6*x-11/3 = 0
y-5/6*x-11/3 = 0
y-5/6*x-11/3 = 0 // - y-11/3
-5/6*x = -(y-11/3) // : -5/6
x = (-(y-11/3))/(-5/6)
x = -6/5*(11/3-y)
x = -6/5*(11/3-y)
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