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137=7x+53
We move all terms to the left:
137-(7x+53)=0
We get rid of parentheses
-7x-53+137=0
We add all the numbers together, and all the variables
-7x+84=0
We move all terms containing x to the left, all other terms to the right
-7x=-84
x=-84/-7
x=+12
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