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x/2+42+18=380
We move all terms to the left:
x/2+42+18-(380)=0
We add all the numbers together, and all the variables
x/2-320=0
We multiply all the terms by the denominator
x-320*2=0
We add all the numbers together, and all the variables
x-640=0
We move all terms containing x to the left, all other terms to the right
x=640
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