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(6-x)/7 = (2*x-3)/3 // - (2*x-3)/3
(6-x)/7-((2*x-3)/3) = 0
(6-x)/7+(-1*(2*x-3))/3 = 0
(3*(6-x))/(3*7)+(-1*7*(2*x-3))/(3*7) = 0
3*(6-x)-1*7*(2*x-3) = 0
39-17*x = 0
(39-17*x)/(3*7) = 0
(39-17*x)/(3*7) = 0 // * 3*7
39-17*x = 0
39-17*x = 0 // - 39
-17*x = -39 // : -17
x = -39/(-17)
x = 39/17
x = 39/17
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