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7(6x+7)=553
We move all terms to the left:
7(6x+7)-(553)=0
We multiply parentheses
42x+49-553=0
We add all the numbers together, and all the variables
42x-504=0
We move all terms containing x to the left, all other terms to the right
42x=504
x=504/42
x=12
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