3(5+5a)=120

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



3(5+5a)=120

We move all terms to the left:

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

We add all the numbers together, and all the variables

3(5a+5)-120=0

We multiply parentheses

15a+15-120=0

We add all the numbers together, and all the variables

15a-105=0

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

15a=105

a=105/15

a=7

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