Выполните приведение подобных слагаемых в выражении:

\(\displaystyle 7+7d+d+5+2d=\big(\)[ ]\(\displaystyle +\)[ ]\(\displaystyle +\)[ ]\(\displaystyle \big)\,d\,\,+\)[ ]\(\displaystyle =\)[ ]\(\displaystyle d\,\,+\)[ ]