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2*x+4/7 = 6*x-(8/3) // - 6*x-(8/3)
2*x-(6*x)+4/7+8/3 = 0
2*x-6*x+4/7+8/3 = 0
68/21-4*x = 0 // - 68/21
-4*x = -68/21 // : -4
x = -68/21/(-4)
x = 17/21
x = 17/21
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