-15d--20d=20

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Solution for -15d--20d=20 equation:


-15d--20d=20

We simplify the equation to the form, which is simple to understand 
-15d+20d=20

We move all terms containing d to the left and all other terms to the right. 
-15d+20d=+20

We simplify left and right side of the equation. 
+5d=+20

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

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