210=10d+9*10

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Solution for 210=10d+9*10 equation: 



210=10d+9*10

We move all terms to the left:

210-(10d+9*10)=0

We add all the numbers together, and all the variables

-(10d+90)+210=0

We get rid of parentheses

-10d-90+210=0

We add all the numbers together, and all the variables

-10d+120=0

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

-10d=-120

d=-120/-10

d=+12

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