7(a-3)=8(a+21)

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Solution for 7(a-3)=8(a+21) equation: 



7(a-3)=8(a+21)

We move all terms to the left:

7(a-3)-(8(a+21))=0

We multiply parentheses

7a-(8(a+21))-21=0



We calculate terms in parentheses: -(8(a+21)), so:

8(a+21)

We multiply parentheses

8a+168

Back to the equation:

-(8a+168)



We get rid of parentheses

7a-8a-168-21=0

We add all the numbers together, and all the variables

-1a-189=0

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

-a=189

a=189/-1

a=-189

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