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0.7x-0.8=8.3
We move all terms to the left:
0.7x-0.8-(8.3)=0
We add all the numbers together, and all the variables
0.7x-9.1=0
We move all terms containing x to the left, all other terms to the right
0.7x=9.1
x=9.1/0.7
x=13
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