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(3/7)*x+1 = 7*x-(16/7) // - 7*x-(16/7)
(3/7)*x-(7*x)+16/7+1 = 0
(3/7)*x-7*x+16/7+1 = 0
23/7-46/7*x = 0 // - 23/7
-46/7*x = -23/7 // : -46/7
x = -23/7/(-46/7)
x = 1/2
x = 1/2
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