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-1.9+1.2a=-6.58
We move all terms to the left:
-1.9+1.2a-(-6.58)=0
We add all the numbers together, and all the variables
1.2a+4.68=0
We move all terms containing a to the left, all other terms to the right
1.2a=-4.68
a=-4.68/1.2
a=-3+1/1.1111111111111
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