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0.12=0.8x+x
We move all terms to the left:
0.12-(0.8x+x)=0
We add all the numbers together, and all the variables
-(+1.8x)+0.12=0
We get rid of parentheses
-1.8x+0.12=0
We move all terms containing x to the left, all other terms to the right
-1.8x=-0.12
x=-0.12/-1.8
x=0.12/1.8
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