7d+21=-7

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Solution for 7d+21=-7 equation:


7d + 21 = -7

We simplify the equation to the form, which is simple to understand 
7d+21=-7

We move all terms containing d to the left and all other terms to the right. 
+7d=-7-21

We simplify left and right side of the equation. 
+7d=-28

We divide both sides of the equation by 7 to get d. 
d=-4

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