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6.6a+12=91.2.
We move all terms to the left:
6.6a+12-(91.2.)=0
We add all the numbers together, and all the variables
6.6a+12-0=0
We add all the numbers together, and all the variables
6.6a+12=0
We move all terms containing a to the left, all other terms to the right
6.6a=-12
a=-12/6.6
a=-1+3.8571428571429/4.7142857142857
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