a+3a-4(9-a)=0

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Solution for a+3a-4(9-a)=0 equation: 



a+3a-4(9-a)=0

We add all the numbers together, and all the variables

a+3a-4(-1a+9)=0

We add all the numbers together, and all the variables

4a-4(-1a+9)=0

We multiply parentheses

4a+4a-36=0

We add all the numbers together, and all the variables

8a-36=0

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

8a=36

a=36/8

a=4+1/2

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