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251=75-x
We move all terms to the left:
251-(75-x)=0
We add all the numbers together, and all the variables
-(-1x+75)+251=0
We get rid of parentheses
1x-75+251=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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