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870+0.1x=x
We move all terms to the left:
870+0.1x-(x)=0
We add all the numbers together, and all the variables
-0.9x+870=0
We move all terms containing x to the left, all other terms to the right
-0.9x=-870
x=-870/-0.9
x=966+0.60000000000002/0.9
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