4(a-5)=20

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Solution for 4(a-5)=20 equation: 



4(a-5)=20

We move all terms to the left:

4(a-5)-(20)=0

We multiply parentheses

4a-20-20=0

We add all the numbers together, and all the variables

4a-40=0

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

4a=40

a=40/4

a=10

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