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(5/6)*x+(8/12)*x = 54/12 // - 54/12
(5/6)*x+(8/12)*x-(54/12) = 0
(5/6)*x+(8/12)*x-9/2 = 0
3/2*x-9/2 = 0 // + 9/2
3/2*x = 9/2 // : 3/2
x = 9/2/3/2
x = 3
x = 3
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