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156=55-x
We move all terms to the left:
156-(55-x)=0
We add all the numbers together, and all the variables
-(-1x+55)+156=0
We get rid of parentheses
1x-55+156=0
We add all the numbers together, and all the variables
x+101=0
We move all terms containing x to the left, all other terms to the right
x=-101
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