3(7a-19)=90

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Solution for 3(7a-19)=90 equation: 



3(7a-19)=90

We move all terms to the left:

3(7a-19)-(90)=0

We multiply parentheses

21a-57-90=0

We add all the numbers together, and all the variables

21a-147=0

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

21a=147

a=147/21

a=7

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