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0.8x+0.4=3.6
We move all terms to the left:
0.8x+0.4-(3.6)=0
We add all the numbers together, and all the variables
0.8x-3.2=0
We move all terms containing x to the left, all other terms to the right
0.8x=3.2
x=3.2/0.8
x=4
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