Выполните приведение подобных слагаемых в выражении:

\(\displaystyle 15a+18a+7+7a+19+3a+1=\)

\(\displaystyle =\big(\)[ ]\(\displaystyle +\)[ ]\(\displaystyle +\)[ ]\(\displaystyle +\)[ ]\(\displaystyle \big)\,a\,+\)[ ]\(\displaystyle =\)[ ]\(\displaystyle \,a\,+\)[ ]