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0.18a+0.4(10-a)=0.2(10
We move all terms to the left:
0.18a+0.4(10-a)-(0.2(10)=0
We add all the numbers together, and all the variables
0.18a+0.4(-1a+10)-(0.210=0
We add all the numbers together, and all the variables
0.18a+0.4(-1a+10)=0
We multiply parentheses
0.18a-0.4a+4=0
We add all the numbers together, and all the variables
-0.22a+4=0
We move all terms containing a to the left, all other terms to the right
-0.22a=-4
a=-4/-0.22
a=18+0.04/0.22
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