3/5(20а-10б)-7/9(18а-27б)
3(4a-2b)-7(2a-3b)
12a-6b-14a+21b
-2a+15b
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3/5(20а-10б)-7/9(18а-27б)
3(4a-2b)-7(2a-3b)
12a-6b-14a+21b
-2a+15b