1/3(2a-9)-1/2(5b+4)=2/3a-3-5/2b-2=2/3a-5/2b-5
2/3*4 1/2-5/2*4/15-5=2/3*9/2-5/2*4/15-5=3-2/3-5=-2 2/3
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1/3(2a-9)-1/2(5b+4)=2/3a-3-5/2b-2=2/3a-5/2b-5
2/3*4 1/2-5/2*4/15-5=2/3*9/2-5/2*4/15-5=3-2/3-5=-2 2/3