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161=31-x
We move all terms to the left:
161-(31-x)=0
We add all the numbers together, and all the variables
-(-1x+31)+161=0
We get rid of parentheses
1x-31+161=0
We add all the numbers together, and all the variables
x+130=0
We move all terms containing x to the left, all other terms to the right
x=-130
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