-d+(-3d)=-20

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


-d+(-3d)=-20

We simplify the equation to the form, which is simple to understand 
-d+(-3d)=-20

Remove unnecessary parentheses
-d-3d=-20

We move all terms containing d to the left and all other terms to the right. 
-1d-3d=-20

We simplify left and right side of the equation. 
-4d=-20

We divide both sides of the equation by -4 to get d. 
d=5

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