3(2+a)=18

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Solution for 3(2+a)=18 equation: 



3(2+a)=18

We move all terms to the left:

3(2+a)-(18)=0

We add all the numbers together, and all the variables

3(a+2)-18=0

We multiply parentheses

3a+6-18=0

We add all the numbers together, and all the variables

3a-12=0

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

3a=12

a=12/3

a=4

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