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x in (-oo:+oo)
y+5 = (6/7)*(x-4) // - (6/7)*(x-4)
y-((6/7)*(x-4))+5 = 0
(-6/7)*(x-4)+y+5 = 0
y-6/7*(x-4)+5 = 0
y-6/7*(x-4)+5 = 0
y-6/7*x+24/7+5 = 0
y-6/7*x+59/7 = 0
y-6/7*x+59/7 = 0
y-6/7*x+59/7 = 0 // - y+59/7
-6/7*x = -(y+59/7) // : -6/7
x = (-(y+59/7))/(-6/7)
x = 7/6*(y+59/7)
x = 7/6*(y+59/7)
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