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x/3 = 7/12-(2*x) // - 7/12-(2*x)
x/3+2*x-(7/12) = 0
x/3+2*x-7/12 = 0
7/3*x-7/12 = 0 // + 7/12
7/3*x = 7/12 // : 7/3
x = 7/12/7/3
x = 1/4
x = 1/4
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