1+2+3+4+5+6+7+8+9=2a+5

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Solution for 1+2+3+4+5+6+7+8+9=2a+5 equation: 



1+2+3+4+5+6+7+8+9=2a+5

We move all terms to the left:

1+2+3+4+5+6+7+8+9-(2a+5)=0

We add all the numbers together, and all the variables

-(2a+5)+45=0

We get rid of parentheses

-2a-5+45=0

We add all the numbers together, and all the variables

-2a+40=0

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

-2a=-40

a=-40/-2

a=+20

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