10d+21=12d+19

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Solution for 10d+21=12d+19 equation: 



10d+21=12d+19

We move all terms to the left:

10d+21-(12d+19)=0

We get rid of parentheses

10d-12d-19+21=0

We add all the numbers together, and all the variables

-2d+2=0

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

-2d=-2

d=-2/-2

d=1

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