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7(5x-3)=266
We move all terms to the left:
7(5x-3)-(266)=0
We multiply parentheses
35x-21-266=0
We add all the numbers together, and all the variables
35x-287=0
We move all terms containing x to the left, all other terms to the right
35x=287
x=287/35
x=8+1/5
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