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2(21-2d/3)+4d=22
We simplify the equation to the form, which is simple to understand
2(21-2d/3)+4d=22
Reorder the terms in parentheses
+(+42-1.3333333333333d)+4d=22
Remove unnecessary parentheses
+42-1.3333333333333d+4d=+22
We move all terms containing d to the left and all other terms to the right.
-1.3333333333333d+4d=+22-42
We simplify left and right side of the equation.
+2.6666666666667d=-20
We divide both sides of the equation by 2.6666666666667 to get d.
d=-7.4999999999999
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