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0.52x+0.12=0.4
We move all terms to the left:
0.52x+0.12-(0.4)=0
We add all the numbers together, and all the variables
0.52x-0.28=0
We move all terms containing x to the left, all other terms to the right
0.52x=0.28
x=0.28/0.52
x=0.28/0.52
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