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50-x/2=30
We move all terms to the left:
50-x/2-(30)=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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