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0.8x-0.85-x=6.4
We move all terms to the left:
0.8x-0.85-x-(6.4)=0
We add all the numbers together, and all the variables
-0.2x-7.25=0
We move all terms containing x to the left, all other terms to the right
-0.2x=7.25
x=7.25/-0.2
x=-36+0.05/0.2
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