2/3a-(2/3a-2/3b)-3/4b
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2/3a-(2/3a-2/3b)-3/4b
2/3a-(2/3a-2/3b)-3/4b
2/3a-(2/3a-2/3b)-3/4b
=2/3a-2/3a+2/3b-3/4b
=-1/12b
2/3a-(2/3a-2/3b)-3/4b
=2/3a-2/3a+2/3b-3/4b
=-1/12b
2/3a-(2/3a-2/3b)-3/4b
=2/3a-2/3a+2/3b-3/4b
=(2/3-2/3)a+(2/3-3/4)b
=-1/12b
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