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150=n*3
We move all terms to the left:
150-(n*3)=0
We add all the numbers together, and all the variables
-(+n*3)+150=0
We get rid of parentheses
-n*3+150=0
Wy multiply elements
-3n+150=0
We move all terms containing n to the left, all other terms to the right
-3n=-150
n=-150/-3
n=+50
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