21=3p-;9

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Solution for 21=3p-;9 equation:



21=3p-9
We move all terms to the left:
21-(3p-9)=0
We get rid of parentheses
-3p+9+21=0
We add all the numbers together, and all the variables
-3p+30=0
We move all terms containing p to the left, all other terms to the right
-3p=-30
p=-30/-3
p=+10

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