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0.9x-6.4=0.8
We move all terms to the left:
0.9x-6.4-(0.8)=0
We add all the numbers together, and all the variables
0.9x-7.2=0
We move all terms containing x to the left, all other terms to the right
0.9x=7.2
x=7.2/0.9
x=8
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