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87=263-x
We move all terms to the left:
87-(263-x)=0
We add all the numbers together, and all the variables
-(-1x+263)+87=0
We get rid of parentheses
1x-263+87=0
We add all the numbers together, and all the variables
x-176=0
We move all terms containing x to the left, all other terms to the right
x=176
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