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2x+9.4=39.8
We move all terms to the left:
2x+9.4-(39.8)=0
We add all the numbers together, and all the variables
2x-30.4=0
We move all terms containing x to the left, all other terms to the right
2x=30.4
x=30.4/2
x=15+0.4/2
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