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8.9-0.2x=7.9
We move all terms to the left:
8.9-0.2x-(7.9)=0
We add all the numbers together, and all the variables
-0.2x+1=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-1
x=-1/-0.2
x=+5
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