d-3.9=-12.1

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Solution for d-3.9=-12.1 equation:


d-3.9=-12.1

We simplify the equation to the form, which is simple to understand 
d-3.9=-12.1

We move all terms containing d to the left and all other terms to the right. 
+1d=-12.1+3.9

We simplify left and right side of the equation. 
+1d=-8.2

We divide both sides of the equation by 1 to get d. 
d=-8.2

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