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-3x+3.4=12.2
We move all terms to the left:
-3x+3.4-(12.2)=0
We add all the numbers together, and all the variables
-3x-8.8=0
We move all terms containing x to the left, all other terms to the right
-3x=8.8
x=8.8/-3
x=-2+2.8/3
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