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3/7-(5*x) = 4 // - 4
3/7-(5*x)-4 = 0
3/7-5*x-4 = 0
-5*x-25/7 = 0 // + 25/7
-5*x = 25/7 // : -5
x = 25/7/(-5)
x = -5/7
x = -5/7
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