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(5/6)*x = 6/7-((3/11)*x) // - 6/7-((3/11)*x)
(5/6)*x+(3/11)*x-(6/7) = 0
(5/6)*x+(3/11)*x-6/7 = 0
73/66*x-6/7 = 0 // + 6/7
73/66*x = 6/7 // : 73/66
x = 6/7/73/66
x = 396/511
x = 396/511
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