0.5a+0.6(40-a)=21

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Solution for 0.5a+0.6(40-a)=21 equation: 



0.5a+0.6(40-a)=21

We move all terms to the left:

0.5a+0.6(40-a)-(21)=0

We add all the numbers together, and all the variables

0.5a+0.6(-1a+40)-21=0

We multiply parentheses

0.5a-0.6a+24-21=0

We add all the numbers together, and all the variables

-0.1a+3=0

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

-0.1a=-3

a=-3/-0.1

a=+30

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