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13/3-(7*x) = 5 // - 5
13/3-(7*x)-5 = 0
13/3-7*x-5 = 0
-7*x-2/3 = 0 // + 2/3
-7*x = 2/3 // : -7
x = 2/3/(-7)
x = -2/21
x = -2/21
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