129=2a+5(2a-3)

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Solution for 129=2a+5(2a-3) equation: 



129=2a+5(2a-3)

We move all terms to the left:

129-(2a+5(2a-3))=0



We calculate terms in parentheses: -(2a+5(2a-3)), so:

2a+5(2a-3)

We multiply parentheses

2a+10a-15

We add all the numbers together, and all the variables

12a-15

Back to the equation:

-(12a-15)



We get rid of parentheses

-12a+15+129=0

We add all the numbers together, and all the variables

-12a+144=0

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

-12a=-144

a=-144/-12

a=+12

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