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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
16/21-8*x = 0 // - 16/21
-8*x = -16/21 // : -8
x = -16/21/(-8)
x = 2/21
x = 2/21
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