2a+7-5a+8=3(5+6a)-12a

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Solution for 2a+7-5a+8=3(5+6a)-12a equation: 



2a+7-5a+8=3(5+6a)-12a

We move all terms to the left:

2a+7-5a+8-(3(5+6a)-12a)=0

We add all the numbers together, and all the variables

2a-5a-(3(6a+5)-12a)+7+8=0

We add all the numbers together, and all the variables

-3a-(3(6a+5)-12a)+15=0



We calculate terms in parentheses: -(3(6a+5)-12a), so:

3(6a+5)-12a

We add all the numbers together, and all the variables

-12a+3(6a+5)

We multiply parentheses

-12a+18a+15

We add all the numbers together, and all the variables

6a+15

Back to the equation:

-(6a+15)



We get rid of parentheses

-3a-6a-15+15=0

We add all the numbers together, and all the variables

-9a=0

a=0/-9

a=0

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