10d-(-2d)+(-3d)-20d-(-d)=-20

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Solution for 10d-(-2d)+(-3d)-20d-(-d)=-20 equation: 



10d-(-2d)+(-3d)-20d-(-d)=-20

We move all terms to the left:

10d-(-2d)+(-3d)-20d-(-d)-(-20)=0

We add all the numbers together, and all the variables

10d-(-2d)+(-3d)-20d-(-1d)-(-20)=0

We add all the numbers together, and all the variables

-10d-(-2d)+(-3d)-(-1d)+20=0

We get rid of parentheses

-10d+2d-3d+1d+20=0

We add all the numbers together, and all the variables

-10d+20=0

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

-10d=-20

d=-20/-10

d=+2

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