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15=166-x
We move all terms to the left:
15-(166-x)=0
We add all the numbers together, and all the variables
-(-1x+166)+15=0
We get rid of parentheses
1x-166+15=0
We add all the numbers together, and all the variables
x-151=0
We move all terms containing x to the left, all other terms to the right
x=151
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