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((1*2)/3)*(1/3-3) = (1*5)/(3^2)-(7*x) // - (1*5)/(3^2)-(7*x)
7*x+((1*2)/3)*(1/3-3)-((1*5)/(3^2)) = 0
7*x+(2/3)*(1/3-3)-5*3^-2 = 0
7*x-7/3 = 0 // + 7/3
7*x = 7/3 // : 7
x = 7/3/7
x = 1/3
x = 1/3
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