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2a-22.8+a-3.5+a+1.2+20.5=360
We move all terms to the left:
2a-22.8+a-3.5+a+1.2+20.5-(360)=0
We add all the numbers together, and all the variables
4a-364.6=0
We move all terms containing a to the left, all other terms to the right
4a=364.6
a=364.6/4
a=91+0.60000000000002/4
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