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199=145-x
We move all terms to the left:
199-(145-x)=0
We add all the numbers together, and all the variables
-(-1x+145)+199=0
We get rid of parentheses
1x-145+199=0
We add all the numbers together, and all the variables
x+54=0
We move all terms containing x to the left, all other terms to the right
x=-54
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