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40-x/2=30
We move all terms to the left:
40-x/2-(30)=0
We add all the numbers together, and all the variables
-x/2+10=0
We multiply all the terms by the denominator
-x+10*2=0
We add all the numbers together, and all the variables
-1x+20=0
We move all terms containing x to the left, all other terms to the right
-x=-20
x=-20/-1
x=+20
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