2a+(4a+18)=90

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Solution for 2a+(4a+18)=90 equation: 



2a+(4a+18)=90

We move all terms to the left:

2a+(4a+18)-(90)=0

We get rid of parentheses

2a+4a+18-90=0

We add all the numbers together, and all the variables

6a-72=0

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

6a=72

a=72/6

a=12

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