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x in (-oo:+oo)
4*x-(1/3) = 12*x-(3/7) // - 12*x-(3/7)
4*x-(12*x)-(1/3)+3/7 = 0
4*x-12*x-1/3+3/7 = 0
2/21-8*x = 0 // - 2/21
-8*x = -2/21 // : -8
x = -2/21/(-8)
x = 1/84
x = 1/84
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