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a+0.19a=450
We move all terms to the left:
a+0.19a-(450)=0
We add all the numbers together, and all the variables
1.19a-450=0
We move all terms containing a to the left, all other terms to the right
1.19a=450
a=450/1.19
a=378+0.18000000000001/1.19
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