9 5
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To factor the expression 15a - 25b + 20, we first look for common factors among the terms. The greatest common factor among the coefficients is 5. We can then factor out 5 to get 5(3a - 5b + 4). This is the factored form of the expression 15a - 25b + 20.
The GCF is 5b.
9a-99 = -90
2a+5b isn't possible the answer is still 2a+5b.
9a - 8a = a