simplifying pre algebra expressions.help plz?

I

Iloveboobies Xp

New member
first can someone explain how to simplify them step by step .btw this is one im tryna do.
------> (17x - 5) - 12x <------ and -------> 2(2x+5) - 3(4x - 10).
and remember im not solving im simplifying.
 
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