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0.7a+0.8(20-a)=15.2
We move all terms to the left:
0.7a+0.8(20-a)-(15.2)=0
We add all the numbers together, and all the variables
0.7a+0.8(-1a+20)-(15.2)=0
We add all the numbers together, and all the variables
0.7a+0.8(-1a+20)-15.2=0
We multiply parentheses
0.7a-0.8a+16-15.2=0
We add all the numbers together, and all the variables
-0.1a+0.8=0
We move all terms containing a to the left, all other terms to the right
-0.1a=-0.8
a=-0.8/-0.1
a=+8
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