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

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



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

We move all terms to the left:

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

We multiply parentheses

2a+10a-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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