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0.4=0.1x-0.02
We move all terms to the left:
0.4-(0.1x-0.02)=0
We get rid of parentheses
-0.1x+0.02+0.4=0
We add all the numbers together, and all the variables
-0.1x+0.42=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-0.42
x=-0.42/-0.1
x=4+0.02/0.1
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