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2*x+4 = 7*x-(1/7) // - 7*x-(1/7)
2*x-(7*x)+1/7+4 = 0
2*x-7*x+1/7+4 = 0
29/7-5*x = 0 // - 29/7
-5*x = -29/7 // : -5
x = -29/7/(-5)
x = 29/35
x = 29/35
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