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3-x/1=7
We move all terms to the left:
3-x/1-(7)=0
We add all the numbers together, and all the variables
-x/1-4=0
We multiply all the terms by the denominator
-x-4*1=0
We add all the numbers together, and all the variables
-1x-4=0
We move all terms containing x to the left, all other terms to the right
-x=4
x=4/-1
x=-4
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