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138=7x+23
We move all terms to the left:
138-(7x+23)=0
We get rid of parentheses
-7x-23+138=0
We add all the numbers together, and all the variables
-7x+115=0
We move all terms containing x to the left, all other terms to the right
-7x=-115
x=-115/-7
x=16+3/7
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