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x in (-oo:+oo)
y = x/4-(5/7) // - x/4-(5/7)
y-(x/4)+5/7 = 0
y-1/4*x+5/7 = 0 // - y+5/7
-1/4*x = -(y+5/7) // : -1/4
x = (-(y+5/7))/(-1/4)
x = 4*(y+5/7)
x = 4*(y+5/7)
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