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d-4=16-9d
We simplify the equation to the form, which is simple to understand
d-4=16-9d
We move all terms containing d to the left and all other terms to the right.
+1d+9d=+16+4
We simplify left and right side of the equation.
+10d=+20
We divide both sides of the equation by 10 to get d.
d=2
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