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2(d+1)-4=4
We simplify the equation to the form, which is simple to understand
2(d+1)-4=4
Reorder the terms in parentheses
+(+2d+2)-4=4
Remove unnecessary parentheses
+2d+2-4=+4
We move all terms containing d to the left and all other terms to the right.
+2d=+4-2+4
We simplify left and right side of the equation.
+2d=+6
We divide both sides of the equation by 2 to get d.
d=3
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