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(5*x)/5+3 = 4-(x/7) // - 4-(x/7)
(5*x)/5+x/7-4+3 = 0
8/7*x-1 = 0 // + 1
8/7*x = 1 // : 8/7
x = 1/8/7
x = 7/8
x = 7/8
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