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3*x+1/6 = 5/6-(4*x) // - 5/6-(4*x)
3*x+4*x+1/6-(5/6) = 0
3*x+4*x+1/6-5/6 = 0
7*x-2/3 = 0 // + 2/3
7*x = 2/3 // : 7
x = 2/3/7
x = 2/21
x = 2/21
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