(a-7)8=72

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Solution for (a-7)8=72 equation: 



(a-7)8=72

We move all terms to the left:

(a-7)8-(72)=0

We multiply parentheses

8a-56-72=0

We add all the numbers together, and all the variables

8a-128=0

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

8a=128

a=128/8

a=16

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