Simplify combining like terms 

21b -32+7b-20b =

-z²+13z²-5z+7z³-15z =

p-(p-q)-q-(q-p) =

3a-2a-ab-(a-b+ab)+3ab+-a =

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ASMI DHANURKAR
Dec. 3, 2020, 7:01 p.m.