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0.4a+0.1(20-a)=3.6
We move all terms to the left:
0.4a+0.1(20-a)-(3.6)=0
We add all the numbers together, and all the variables
0.4a+0.1(-1a+20)-(3.6)=0
We add all the numbers together, and all the variables
0.4a+0.1(-1a+20)-3.6=0
We multiply parentheses
0.4a-0.1a+2-3.6=0
We add all the numbers together, and all the variables
0.3a-1.6=0
We move all terms containing a to the left, all other terms to the right
0.3a=1.6
a=1.6/0.3
a=5+0.1/0.3
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