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39=18-5x
We move all terms to the left:
39-(18-5x)=0
We add all the numbers together, and all the variables
-(-5x+18)+39=0
We get rid of parentheses
5x-18+39=0
We add all the numbers together, and all the variables
5x+21=0
We move all terms containing x to the left, all other terms to the right
5x=-21
x=-21/5
x=-4+1/5
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