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48=7x-+20
We move all terms to the left:
48-(7x-+20)=0
We add all the numbers together, and all the variables
-(+7x)+48=0
We get rid of parentheses
-7x+48=0
We move all terms containing x to the left, all other terms to the right
-7x=-48
x=-48/-7
x=6+6/7
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