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425=320+x
We move all terms to the left:
425-(320+x)=0
We add all the numbers together, and all the variables
-(x+320)+425=0
We get rid of parentheses
-x-320+425=0
We add all the numbers together, and all the variables
-1x+105=0
We move all terms containing x to the left, all other terms to the right
-x=-105
x=-105/-1
x=+105
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