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4=0.1x-0.02.
We move all terms to the left:
4-(0.1x-0.02.)=0
We add all the numbers together, and all the variables
-(+0.1x)+4=0
We get rid of parentheses
-0.1x+4=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-4
x=-4/-0.1
x=+40
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