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0.4x+16.4=42
We move all terms to the left:
0.4x+16.4-(42)=0
We add all the numbers together, and all the variables
0.4x-25.6=0
We move all terms containing x to the left, all other terms to the right
0.4x=25.6
x=25.6/0.4
x=64
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