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