4a=120-(3a+15)

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Solution for 4a=120-(3a+15) equation: 



4a=120-(3a+15)

We move all terms to the left:

4a-(120-(3a+15))=0



We calculate terms in parentheses: -(120-(3a+15)), so:

120-(3a+15)

determiningTheFunctionDomain
-(3a+15)+120

We get rid of parentheses

-3a-15+120

We add all the numbers together, and all the variables

-3a+105

Back to the equation:

-(-3a+105)



We get rid of parentheses

4a+3a-105=0

We add all the numbers together, and all the variables

7a-105=0

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

7a=105

a=105/7

a=15

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