20d-19=2(13d+20)+19

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Solution for 20d-19=2(13d+20)+19 equation: 



20d-19=2(13d+20)+19

We move all terms to the left:

20d-19-(2(13d+20)+19)=0



We calculate terms in parentheses: -(2(13d+20)+19), so:

2(13d+20)+19

We multiply parentheses

26d+40+19

We add all the numbers together, and all the variables

26d+59

Back to the equation:

-(26d+59)



We get rid of parentheses

20d-26d-59-19=0

We add all the numbers together, and all the variables

-6d-78=0

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

-6d=78

d=78/-6

d=-13

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