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3*x-(1/3) = (-1/3)*x+15/7 // - (-1/3)*x+15/7
3*x-((-1/3)*x)-(1/3)-(15/7) = 0
3*x+(1/3)*x-1/3-15/7 = 0
10/3*x-52/21 = 0 // + 52/21
10/3*x = 52/21 // : 10/3
x = 52/21/10/3
x = 26/35
x = 26/35
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