4(a-1)=16

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Solution for 4(a-1)=16 equation: 



4(a-1)=16

We move all terms to the left:

4(a-1)-(16)=0

We multiply parentheses

4a-4-16=0

We add all the numbers together, and all the variables

4a-20=0

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

4a=20

a=20/4

a=5

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