1a+3(1a-1)=9

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Solution for 1a+3(1a-1)=9 equation: 



1a+3(1a-1)=9

We move all terms to the left:

1a+3(1a-1)-(9)=0

We add all the numbers together, and all the variables

1a+3(a-1)-9=0

We add all the numbers together, and all the variables

a+3(a-1)-9=0

We multiply parentheses

a+3a-3-9=0

We add all the numbers together, and all the variables

4a-12=0

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

4a=12

a=12/4

a=3

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