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12 + 2d = 48
We simplify the equation to the form, which is simple to understand
12+2d=48
We move all terms containing d to the left and all other terms to the right.
+2d=+48-12
We simplify left and right side of the equation.
+2d=+36
We divide both sides of the equation by 2 to get d.
d=18
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