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(6*x-66)/5 = (5*x+55)/6 // - (5*x+55)/6
(6*x-66)/5-((5*x+55)/6) = 0
(6*x-66)/5+(-1*(5*x+55))/6 = 0
(6*(6*x-66))/(5*6)+(-1*5*(5*x+55))/(5*6) = 0
6*(6*x-66)-1*5*(5*x+55) = 0
11*x-671 = 0
(11*x-671)/(5*6) = 0
(11*x-671)/(5*6) = 0 // * 5*6
11*x-671 = 0
11*x-671 = 0 // + 671
11*x = 671 // : 11
x = 671/11
x = 61
x = 61
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