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7(3x+5)=266
We move all terms to the left:
7(3x+5)-(266)=0
We multiply parentheses
21x+35-266=0
We add all the numbers together, and all the variables
21x-231=0
We move all terms containing x to the left, all other terms to the right
21x=231
x=231/21
x=11
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