1+2121=a-1

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Solution for 1+2121=a-1 equation: 



1+2121=a-1

We move all terms to the left:

1+2121-(a-1)=0

We add all the numbers together, and all the variables

-(a-1)+2122=0

We get rid of parentheses

-a+1+2122=0

We add all the numbers together, and all the variables

-1a+2123=0

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

-a=-2123

a=-2123/-1

a=+2123

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