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3*x-(2*x)+5/9-(7/6) = 13 // - 13
3*x-(2*x)+5/9-(7/6)-13 = 0
3*x-2*x+5/9-7/6-13 = 0
x-245/18 = 0 // + 245/18
x = 245/18
x = 245/18
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