-(2,3a+1,7b)+(1,3b-1,7a)-(1,5b-5,8a)=-2,3a-1,7b+1,3b-1,7a-1,5b+5,8a=1,8a-1,9b
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-(2,3a+1,7b)+(1,3b-1,7a)-(1,5b-5,8a)=-2,3a-1,7b+1,3b-1,7a-1,5b+5,8a=1,8a-1,9b