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1.2*5+1.2*3+5*3=a
We move all terms to the left:
1.2*5+1.2*3+5*3-(a)=0
We add all the numbers together, and all the variables
-1a+24.6=0
We move all terms containing a to the left, all other terms to the right
-a=-24.6
a=-24.6/-1
a=24+0.6/1
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