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4-0.2a=-8.6
We move all terms to the left:
4-0.2a-(-8.6)=0
We add all the numbers together, and all the variables
-0.2a+12.6=0
We move all terms containing a to the left, all other terms to the right
-0.2a=-12.6
a=-12.6/-0.2
a=62+0.2/0.2
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