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0.4=0.5x=x=3.7
We move all terms to the left:
0.4-(0.5x)=0
We add all the numbers together, and all the variables
-(+0.5x)+0.4=0
We get rid of parentheses
-0.5x+0.4=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-0.4
x=-0.4/-0.5
x=0.4/0.5
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