(a-5)*7=84

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Solution for (a-5)*7=84 equation: 



(a-5)*7=84

We move all terms to the left:

(a-5)*7-(84)=0

We multiply parentheses

7a-35-84=0

We add all the numbers together, and all the variables

7a-119=0

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

7a=119

a=119/7

a=17

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