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56=90-x
We move all terms to the left:
56-(90-x)=0
We add all the numbers together, and all the variables
-(-1x+90)+56=0
We get rid of parentheses
1x-90+56=0
We add all the numbers together, and all the variables
x-34=0
We move all terms containing x to the left, all other terms to the right
x=34
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