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WhoWantsToLearn
We can solve this problem by using PEMDAS 

PEMDAS stands for 
Parenthesis 
Exponents
Multiply
Add
Subtract

So start with (P+3) () is a parenthesis 

Step 1: Subtract 4.5p from both sides
Step 2: Subtract 14.4 from both sides.Step 3: Divide both sides by -0.45.

Answer:p=2