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(3/4)*x-3/7 = 7*x-(178/7) // - 7*x-(178/7)
(3/4)*x-(7*x)-3/7+178/7 = 0
(3/4)*x-7*x-3/7+178/7 = 0
25-25/4*x = 0 // - 25
-25/4*x = -25 // : -25/4
x = -25/(-25/4)
x = 4
x = 4
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