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2+0.1666a=-4
We move all terms to the left:
2+0.1666a-(-4)=0
We add all the numbers together, and all the variables
0.1666a+6=0
We move all terms containing a to the left, all other terms to the right
0.1666a=-6
a=-6/0.1666
a=-36+0.0023999999999997/0.1666
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