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0.6a-4=0.4a=6
We move all terms to the left:
0.6a-4-(0.4a)=0
We add all the numbers together, and all the variables
0.6a-(+0.4a)-4=0
We get rid of parentheses
0.6a-0.4a-4=0
We add all the numbers together, and all the variables
0.2a-4=0
We move all terms containing a to the left, all other terms to the right
0.2a=4
a=4/0.2
a=20
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