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52=0.4(x)
We move all terms to the left:
52-(0.4(x))=0
We add all the numbers together, and all the variables
-(+0.4x)+52=0
We get rid of parentheses
-0.4x+52=0
We move all terms containing x to the left, all other terms to the right
-0.4x=-52
x=-52/-0.4
x=+130
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