(2a-3)+(7a+3)=90

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Solution for (2a-3)+(7a+3)=90 equation: 



(2a-3)+(7a+3)=90

We move all terms to the left:

(2a-3)+(7a+3)-(90)=0

We get rid of parentheses

2a+7a-3+3-90=0

We add all the numbers together, and all the variables

9a-90=0

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

9a=90

a=90/9

a=10

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