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-7.8a=-5.86
We move all terms to the left:
-7.8a-(-5.86)=0
We add all the numbers together, and all the variables
-7.8a+5.86=0
We move all terms containing a to the left, all other terms to the right
-7.8a=-5.86
a=-5.86/-7.8
a=3.15053763441/4.1935483871
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