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7(-5n+3)=266
We move all terms to the left:
7(-5n+3)-(266)=0
We multiply parentheses
-35n+21-266=0
We add all the numbers together, and all the variables
-35n-245=0
We move all terms containing n to the left, all other terms to the right
-35n=245
n=245/-35
n=-7
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