12+3+d=30

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Solution for 12+3+d=30 equation:


12+3+d=30

We simplify the equation to the form, which is simple to understand 
12+3+d=30

We move all terms containing d to the left and all other terms to the right. 
+1d=+30-12-3

We simplify left and right side of the equation. 
+1d=+15

We divide both sides of the equation by 1 to get d. 
d=15

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