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87=13+x
We move all terms to the left:
87-(13+x)=0
We add all the numbers together, and all the variables
-(x+13)+87=0
We get rid of parentheses
-x-13+87=0
We add all the numbers together, and all the variables
-1x+74=0
We move all terms containing x to the left, all other terms to the right
-x=-74
x=-74/-1
x=+74
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