120=5(3+7a)

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Solution for 120=5(3+7a) equation: 



120=5(3+7a)

We move all terms to the left:

120-(5(3+7a))=0

We add all the numbers together, and all the variables

-(5(7a+3))+120=0



We calculate terms in parentheses: -(5(7a+3)), so:

5(7a+3)

We multiply parentheses

35a+15

Back to the equation:

-(35a+15)



We get rid of parentheses

-35a-15+120=0

We add all the numbers together, and all the variables

-35a+105=0

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

-35a=-105

a=-105/-35

a=+3

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