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(7*x)/12 = (5*x)/7-11 // - (5*x)/7-11
(7*x)/12-((5*x)/7)+11 = 0
(7*x)/12+(-5/7)*x+11 = 0
11-11/84*x = 0 // - 11
-11/84*x = -11 // : -11/84
x = -11/(-11/84)
x = 84
x = 84
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