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-7(3+4n)+7n=-168
We move all terms to the left:
-7(3+4n)+7n-(-168)=0
We add all the numbers together, and all the variables
-7(4n+3)+7n-(-168)=0
We add all the numbers together, and all the variables
7n-7(4n+3)+168=0
We multiply parentheses
7n-28n-21+168=0
We add all the numbers together, and all the variables
-21n+147=0
We move all terms containing n to the left, all other terms to the right
-21n=-147
n=-147/-21
n=+7
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