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15+16+2d=55
We simplify the equation to the form, which is simple to understand
15+16+2d=55
We move all terms containing d to the left and all other terms to the right.
+2d=+55-15-16
We simplify left and right side of the equation.
+2d=+24
We divide both sides of the equation by 2 to get d.
d=12
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