7(a+3)=45-3(12-a)

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Solution for 7(a+3)=45-3(12-a) equation: 



7(a+3)=45-3(12-a)

We move all terms to the left:

7(a+3)-(45-3(12-a))=0

We add all the numbers together, and all the variables

7(a+3)-(45-3(-1a+12))=0

We multiply parentheses

7a-(45-3(-1a+12))+21=0



We calculate terms in parentheses: -(45-3(-1a+12)), so:

45-3(-1a+12)

determiningTheFunctionDomain
-3(-1a+12)+45

We multiply parentheses

3a-36+45

We add all the numbers together, and all the variables

3a+9

Back to the equation:

-(3a+9)



We get rid of parentheses

7a-3a-9+21=0

We add all the numbers together, and all the variables

4a+12=0

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

4a=-12

a=-12/4

a=-3

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