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x+(x+39)=49
We move all terms to the left:
x+(x+39)-(49)=0
We get rid of parentheses
x+x+39-49=0
We add all the numbers together, and all the variables
2x-10=0
We move all terms containing x to the left, all other terms to the right
2x=10
x=10/2
x=5
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