4(5a+5)=120

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Solution for 4(5a+5)=120 equation: 



4(5a+5)=120

We move all terms to the left:

4(5a+5)-(120)=0

We multiply parentheses

20a+20-120=0

We add all the numbers together, and all the variables

20a-100=0

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

20a=100

a=100/20

a=5

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