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-54+9d=45
We simplify the equation to the form, which is simple to understand
-54+9d=45
We move all terms containing d to the left and all other terms to the right.
+9d=+45+54
We simplify left and right side of the equation.
+9d=+99
We divide both sides of the equation by 9 to get d.
d=11
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