9a + 7b *remember to look and understand the letters!*
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6a²b - 12ab²
3a + 5b - 6a - 9b = -3a - 4b
12b2 - 8b = 0 4b(3b-2) = 0 4b = 0 and 3b-2 = 0 4b = 0 and 3b = 2 b = 0 and 2/3
It is: 12b2
Well if it is worded right then 4xb-1+(-4)+4b=4b-1-4+4b=4b+4b-1-4=8b-5