-21-2a=7(4.5a+2.5)

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Solution for -21-2a=7(4.5a+2.5) equation: 



-21-2a=7(4.5a+2.5)

We move all terms to the left:

-21-2a-(7(4.5a+2.5))=0



We calculate terms in parentheses: -(7(4.5a+2.5)), so:

7(4.5a+2.5)

We multiply parentheses

28a+17.5

Back to the equation:

-(28a+17.5)



We get rid of parentheses

-2a-28a-17.5-21=0

We add all the numbers together, and all the variables

-30a-38.5=0

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

-30a=38.5

a=38.5/-30

a=-1+3.4/12

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