add the following expression
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5a^2b+7a^2b+(-8a^2)
=12a^2b-8a^2
=4a^2 (3b-2)
x-3y+4z+y-2x-8z+5x-2y-3z
=x-2x+5x-3y+y-2y+4z-8z-3z
=4x-4y-7z
=12a^2b-8a^2
=4a^2 (3b-2)
x-3y+4z+y-2x-8z+5x-2y-3z
=x-2x+5x-3y+y-2y+4z-8z-3z
=4x-4y-7z
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