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6ab+5b-4 - 3ab-7b-12
6ab-3ab+5b-7b-4-12
3ab-2b-16
2. - 4(m+2n-6) - 3(2m-4n+5)
-4m-8n+24 -6m-12n+15
-4m-6m-8n-12n+24+15
-10m-20n+39