3(a+4)-a=36

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Solution for 3(a+4)-a=36 equation: 



3(a+4)-a=36

We move all terms to the left:

3(a+4)-a-(36)=0

We add all the numbers together, and all the variables

-1a+3(a+4)-36=0

We multiply parentheses

-1a+3a+12-36=0

We add all the numbers together, and all the variables

2a-24=0

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

2a=24

a=24/2

a=12

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