79=99+2d

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Solution for 79=99+2d equation: 



79=99+2d

We move all terms to the left:

79-(99+2d)=0

We add all the numbers together, and all the variables

-(2d+99)+79=0

We get rid of parentheses

-2d-99+79=0

We add all the numbers together, and all the variables

-2d-20=0

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

-2d=20

d=20/-2

d=-10

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