(21-a)*8=56

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Solution for (21-a)*8=56 equation: 



(21-a)*8=56

We move all terms to the left:

(21-a)*8-(56)=0

We add all the numbers together, and all the variables

(-1a+21)*8-56=0

We multiply parentheses

-8a+168-56=0

We add all the numbers together, and all the variables

-8a+112=0

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

-8a=-112

a=-112/-8

a=+14

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