3(a+7)+6a-3(a+2)=25

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Solution for 3(a+7)+6a-3(a+2)=25 equation: 



3(a+7)+6a-3(a+2)=25

We move all terms to the left:

3(a+7)+6a-3(a+2)-(25)=0

We add all the numbers together, and all the variables

6a+3(a+7)-3(a+2)-25=0

We multiply parentheses

6a+3a-3a+21-6-25=0

We add all the numbers together, and all the variables

6a-10=0

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

6a=10

a=10/6

a=1+2/3

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