2a+(a+15)=90

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Solution for 2a+(a+15)=90 equation: 



2a+(a+15)=90

We move all terms to the left:

2a+(a+15)-(90)=0

We get rid of parentheses

2a+a+15-90=0

We add all the numbers together, and all the variables

3a-75=0

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

3a=75

a=75/3

a=25

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