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-17.8a-2.4a+25=19.5
We move all terms to the left:
-17.8a-2.4a+25-(19.5)=0
We add all the numbers together, and all the variables
-20.2a+5.5=0
We move all terms containing a to the left, all other terms to the right
-20.2a=-5.5
a=-5.5/-20.2
a=1/3.6727272727273
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