3a+5=-2a+20

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Solution for 3a+5=-2a+20 equation: 



3a+5=-2a+20

We move all terms to the left:

3a+5-(-2a+20)=0

We get rid of parentheses

3a+2a-20+5=0

We add all the numbers together, and all the variables

5a-15=0

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

5a=15

a=15/5

a=3

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