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2.9a+1.8=2a
We move all terms to the left:
2.9a+1.8-(2a)=0
We add all the numbers together, and all the variables
0.9a+1.8=0
We move all terms containing a to the left, all other terms to the right
0.9a=-1.8
a=-1.8/0.9
a=-2
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