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2d+2(2d)+4=40
We simplify the equation to the form, which is simple to understand
2d+2(2d)+4=40
Reorder the terms in parentheses
2d+(+4d)+4=40
Remove unnecessary parentheses
+2d+4d+4=+40
We move all terms containing d to the left and all other terms to the right.
+2d+4d=+40-4
We simplify left and right side of the equation.
+6d=+36
We divide both sides of the equation by 6 to get d.
d=6
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