Answer:
a =
Explanation:
P = multiple both sides by a
aP = On the right side of the equal sign, the a's cancel each other out
aP = F Divide both sides by P
= The P's cancel out on the left side of the equal sign.
P = F/a
Pa = F
a = F/P
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multiple both sides by a 
On the right side of the equal sign, the a's cancel each other out
= 
The P's cancel out on the left side of the equal sign.