(1/9+1/15)*3+(1/12+1/15)X=5/6
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(1/9+1/15)*3+(1/12+1/15)X=5/6(1/9+1/15)*3+(1/12+1/15)X=5/6(1/9+1/15)*3+(1/12+1/15)X=5/6X=2
(1/9+1/15)*3+(1/12+1/15)X=5/6
(1/9+1/15)*3+(1/12+1/15)X=5/6
(1/9+1/15)*3+(1/12+1/15)X=5/6
X=2