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48=3x+x+8x
We move all terms to the left:
48-(3x+x+8x)=0
We add all the numbers together, and all the variables
-(+12x)+48=0
We get rid of parentheses
-12x+48=0
We move all terms containing x to the left, all other terms to the right
-12x=-48
x=-48/-12
x=+4
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