Question 373917
(8zw^2+z^3w^4-9z^2w^2)-(-5z^4w^3-9z^2w^2+7zw^2+z^3w^4-z^4w^3)
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{{{(8zw^2+z^3w^4-9z^2w^2+5z^4w^3+9z^2w^2-7zw^2-z^3w^4+z^4w^3)}}}
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Re arrange the terms 
{{{(8zw^2-7zw^2 +z^3w^4-z^3w^4-9z^2w^2+9z^2w^2+5z^4w^3+z^4w^3)}}}
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{{{(zw^2+0+0+6z^4w^3)}}}
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{{{zw^2(1+6z^3w)}}}
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