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1/7 = (x-6)/49 // - (x-6)/49
1/7-((x-6)/49) = 0
(-1*(x-6))/49+1/7 = 0
(-1*7*(x-6))/(7*49)+(1*49)/(7*49) = 0
1*49-1*7*(x-6) = 0
91-7*x = 0
(91-7*x)/(7*49) = 0
(91-7*x)/(7*49) = 0 // * 7*49
91-7*x = 0
91-7*x = 0 // - 91
-7*x = -91 // : -7
x = -91/(-7)
x = 13
x = 13
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