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-4=-90+3P
We move all terms to the left:
-4-(-90+3P)=0
We add all the numbers together, and all the variables
-(3P-90)-4=0
We get rid of parentheses
-3P+90-4=0
We add all the numbers together, and all the variables
-3P+86=0
We move all terms containing P to the left, all other terms to the right
-3P=-86
P=-86/-3
P=28+2/3
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