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5=12x+8x
We move all terms to the left:
5-(12x+8x)=0
We add all the numbers together, and all the variables
-(+20x)+5=0
We get rid of parentheses
-20x+5=0
We move all terms containing x to the left, all other terms to the right
-20x=-5
x=-5/-20
x=1/4
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