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6.4x-3.2=22.4
We move all terms to the left:
6.4x-3.2-(22.4)=0
We add all the numbers together, and all the variables
6.4x-25.6=0
We move all terms containing x to the left, all other terms to the right
6.4x=25.6
x=25.6/6.4
x=4
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