add the polynomials (4x^2+gb^2+a^2b)+(-7x^2+3a^2b-5b^2)
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subtract
4a−
7ab+
3b+
12
from
12a−
9ab+
5b−
3
=
12a−
9ab+
5b−
3−
(4a−
7ab+
3b+
12)
= 12a− 9ab+ 5b− 3− 4a+ 7ab− 3b− 12
= 8a− 2ab+ 2b− 15
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