4a-7a=15+2(3a-20)

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Solution for 4a-7a=15+2(3a-20) equation: 



4a-7a=15+2(3a-20)

We move all terms to the left:

4a-7a-(15+2(3a-20))=0

We add all the numbers together, and all the variables

-3a-(15+2(3a-20))=0



We calculate terms in parentheses: -(15+2(3a-20)), so:

15+2(3a-20)

determiningTheFunctionDomain
2(3a-20)+15

We multiply parentheses

6a-40+15

We add all the numbers together, and all the variables

6a-25

Back to the equation:

-(6a-25)



We get rid of parentheses

-3a-6a+25=0

We add all the numbers together, and all the variables

-9a+25=0

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

-9a=-25

a=-25/-9

a=2+7/9

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