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7(9+5x)=343
We move all terms to the left:
7(9+5x)-(343)=0
We add all the numbers together, and all the variables
7(5x+9)-343=0
We multiply parentheses
35x+63-343=0
We add all the numbers together, and all the variables
35x-280=0
We move all terms containing x to the left, all other terms to the right
35x=280
x=280/35
x=8
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