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0.4x-1.2=0.3x+0.8
We move all terms to the left:
0.4x-1.2-(0.3x+0.8)=0
We get rid of parentheses
0.4x-0.3x-0.8-1.2=0
We add all the numbers together, and all the variables
0.1x-2=0
We move all terms containing x to the left, all other terms to the right
0.1x=2
x=2/0.1
x=20
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