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x in (-oo:+oo)
y = (2*(x-4))/7 // - (2*(x-4))/7
y-((2*(x-4))/7) = 0
(-2/7)*(x-4)+y = 0
y-2/7*(x-4) = 0
y-2/7*(x-4) = 0
y-2/7*x+8/7 = 0
y-2/7*x+8/7 = 0
y-2/7*x+8/7 = 0 // - y+8/7
-2/7*x = -(y+8/7) // : -2/7
x = (-(y+8/7))/(-2/7)
x = 7/2*(y+8/7)
x = 7/2*(y+8/7)
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