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7(7x+13)=385
We move all terms to the left:
7(7x+13)-(385)=0
We multiply parentheses
49x+91-385=0
We add all the numbers together, and all the variables
49x-294=0
We move all terms containing x to the left, all other terms to the right
49x=294
x=294/49
x=6
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