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253=166-x
We move all terms to the left:
253-(166-x)=0
We add all the numbers together, and all the variables
-(-1x+166)+253=0
We get rid of parentheses
1x-166+253=0
We add all the numbers together, and all the variables
x+87=0
We move all terms containing x to the left, all other terms to the right
x=-87
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