(a-13)*4=28

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Solution for (a-13)*4=28 equation: 



(a-13)*4=28

We move all terms to the left:

(a-13)*4-(28)=0

We multiply parentheses

4a-52-28=0

We add all the numbers together, and all the variables

4a-80=0

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

4a=80

a=80/4

a=20

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