3(a+5+2a)=18

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Solution for 3(a+5+2a)=18 equation: 



3(a+5+2a)=18

We move all terms to the left:

3(a+5+2a)-(18)=0

We add all the numbers together, and all the variables

3(3a+5)-18=0

We multiply parentheses

9a+15-18=0

We add all the numbers together, and all the variables

9a-3=0

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

9a=3

a=3/9

a=1/3

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