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0.4=x*10
We move all terms to the left:
0.4-(x*10)=0
We add all the numbers together, and all the variables
-(+x*10)+0.4=0
We get rid of parentheses
-x*10+0.4=0
Wy multiply elements
-10x+0.4=0
We move all terms containing x to the left, all other terms to the right
-10x=-0.4
x=-0.4/-10
x=0.4/10
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