4(a-9)=20

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Solution for 4(a-9)=20 equation: 



4(a-9)=20

We move all terms to the left:

4(a-9)-(20)=0

We multiply parentheses

4a-36-20=0

We add all the numbers together, and all the variables

4a-56=0

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

4a=56

a=56/4

a=14

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