(20a-10)=90

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Solution for (20a-10)=90 equation: 



(20a-10)=90

We move all terms to the left:

(20a-10)-(90)=0

We get rid of parentheses

20a-10-90=0

We add all the numbers together, and all the variables

20a-100=0

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

20a=100

a=100/20

a=5

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