6(7a+1)=90

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Solution for 6(7a+1)=90 equation: 



6(7a+1)=90

We move all terms to the left:

6(7a+1)-(90)=0

We multiply parentheses

42a+6-90=0

We add all the numbers together, and all the variables

42a-84=0

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

42a=84

a=84/42

a=2

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