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0=0.4x+5.2
We move all terms to the left:
0-(0.4x+5.2)=0
We add all the numbers together, and all the variables
-(0.4x+5.2)=0
We get rid of parentheses
-0.4x-5.2=0
We move all terms containing x to the left, all other terms to the right
-0.4x=5.2
x=5.2/-0.4
x=-13
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