4(5a-10)=40

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Solution for 4(5a-10)=40 equation: 



4(5a-10)=40

We move all terms to the left:

4(5a-10)-(40)=0

We multiply parentheses

20a-40-40=0

We add all the numbers together, and all the variables

20a-80=0

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

20a=80

a=80/20

a=4

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