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x in (-oo:+oo)
y = x/3+4/7 // - x/3+4/7
y-(x/3)-(4/7) = 0
y-(x/3)-4/7 = 0
y-1/3*x-4/7 = 0 // - y-4/7
-1/3*x = -(y-4/7) // : -1/3
x = (-(y-4/7))/(-1/3)
x = -3*(4/7-y)
x = -3*(4/7-y)
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