99+10=89+d

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Solution for 99+10=89+d equation: 



99+10=89+d

We move all terms to the left:

99+10-(89+d)=0

We add all the numbers together, and all the variables

-(d+89)+99+10=0

We add all the numbers together, and all the variables

-(d+89)+109=0

We get rid of parentheses

-d-89+109=0

We add all the numbers together, and all the variables

-1d+20=0

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

-d=-20

d=-20/-1

d=+20

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