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a=-3.9(2000)+945
We move all terms to the left:
a-(-3.9(2000)+945)=0
We add all the numbers together, and all the variables
a-(941.08)=0
We add all the numbers together, and all the variables
a-941.08=0
We move all terms containing a to the left, all other terms to the right
a=941.08
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