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4-(x/8) = 7*x-(1/3) // - 7*x-(1/3)
1/3-(x/8)-(7*x)+4 = 0
1/3-(x/8)-7*x+4 = 0
13/3-57/8*x = 0 // - 13/3
-57/8*x = -13/3 // : -57/8
x = -13/3/(-57/8)
x = 104/171
x = 104/171
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