0.3a+0.5(20-a)=7

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Solution for 0.3a+0.5(20-a)=7 equation: 



0.3a+0.5(20-a)=7

We move all terms to the left:

0.3a+0.5(20-a)-(7)=0

We add all the numbers together, and all the variables

0.3a+0.5(-1a+20)-7=0

We multiply parentheses

0.3a-0.5a+10-7=0

We add all the numbers together, and all the variables

-0.2a+3=0

We move all terms containing a to the left, all other terms to the right

-0.2a=-3

a=-3/-0.2

a=+15

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