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a-90=7.8-2.6
We move all terms to the left:
a-90-(7.8-2.6)=0
We add all the numbers together, and all the variables
a-90-(5.2)=0
We add all the numbers together, and all the variables
a-95.2=0
We move all terms containing a to the left, all other terms to the right
a=95.2
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