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3*x-(2/7) = 6*x-(5/13) // - 6*x-(5/13)
3*x-(6*x)-(2/7)+5/13 = 0
3*x-6*x-2/7+5/13 = 0
9/91-3*x = 0 // - 9/91
-3*x = -9/91 // : -3
x = -9/91/(-3)
x = 3/91
x = 3/91
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