(2a+5)-(a+7)=20

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Solution for (2a+5)-(a+7)=20 equation: 



(2a+5)-(a+7)=20

We move all terms to the left:

(2a+5)-(a+7)-(20)=0

We get rid of parentheses

2a-a+5-7-20=0

We add all the numbers together, and all the variables

a-22=0

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

a=22

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