2ab, -7ab, 2/3ab, 9ab
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2ab,-7ab,2/3ab,9ab
solve
2ab-7ab+2/3ab+9ab
2ab-7ab-9ab+2/3ab
2ab-16ab+2/3ab
-14ab+2
3ab
cross multiply
2=-42ab
-42ab
2 =-21
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