9a+20=7a+4

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Solution for 9a+20=7a+4 equation: 



9a+20=7a+4

We move all terms to the left:

9a+20-(7a+4)=0

We get rid of parentheses

9a-7a-4+20=0

We add all the numbers together, and all the variables

2a+16=0

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

2a=-16

a=-16/2

a=-8

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