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x in (-oo:+oo)
y+4 = (6/7)*(x-4) // - (6/7)*(x-4)
y-((6/7)*(x-4))+4 = 0
(-6/7)*(x-4)+y+4 = 0
y-6/7*(x-4)+4 = 0
y-6/7*(x-4)+4 = 0
y-6/7*x+24/7+4 = 0
y-6/7*x+52/7 = 0
y-6/7*x+52/7 = 0
y-6/7*x+52/7 = 0 // - y+52/7
-6/7*x = -(y+52/7) // : -6/7
x = (-(y+52/7))/(-6/7)
x = 7/6*(y+52/7)
x = 7/6*(y+52/7)
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