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(2*x)/7 = (x-1)/3 // - (x-1)/3
(2*x)/7-((x-1)/3) = 0
(-1*(x-1))/3+(2*x)/7 = 0
(-1*7*(x-1))/(3*7)+(2*3*x)/(3*7) = 0
2*3*x-1*7*(x-1) = 0
7-x = 0
(7-x)/(3*7) = 0
(7-x)/(3*7) = 0 // * 3*7
7-x = 0
7-x = 0 // - 7
-x = -7 // * -1
x = 7
x = 7
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