-12=2+5d+2d

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Solution for -12=2+5d+2d equation: 



-12=2+5d+2d

We move all terms to the left:

-12-(2+5d+2d)=0

We add all the numbers together, and all the variables

-(7d+2)-12=0

We get rid of parentheses

-7d-2-12=0

We add all the numbers together, and all the variables

-7d-14=0

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

-7d=14

d=14/-7

d=-2

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