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25-x/2=45
We move all terms to the left:
25-x/2-(45)=0
We add all the numbers together, and all the variables
-x/2-20=0
We multiply all the terms by the denominator
-x-20*2=0
We add all the numbers together, and all the variables
-1x-40=0
We move all terms containing x to the left, all other terms to the right
-x=40
x=40/-1
x=-40
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