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-9x-6.8=8.7
We move all terms to the left:
-9x-6.8-(8.7)=0
We add all the numbers together, and all the variables
-9x-15.5=0
We move all terms containing x to the left, all other terms to the right
-9x=15.5
x=15.5/-9
x=-1+1.85714285714/2.57142857143
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