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-2b +5a+[a-2 [a+3b-4a-4b]-12a]
-2b +5a+[a-2[-3a-b]-12a]
-2b +5a+[a+6a+2b-12a]
-2b+5a+a+6a+2b-12a
-2b+6a+6a+2b-12a= 0