$$ \begin{flalign*} & \textbf{Aufgabe} & \a) \\12 X + 12 = -15 \b) \hspace{1cm} & \7 X + 5 = -10 \\ c) \hspace{1cm} & \12 X + 3 + 9 = 10 - 3 X \ d) \hspace{1cm} & \-15 X + 3 = -29 \\ e) \hspace{1cm} & \8 X + 3 -29 = 8 X + 3 -29 \ f) \hspace{1cm} & \13 X + 3 = -29 + -29 X \\ h) \hspace{1cm} & \8 X + 3 + 2X - -29 = 8 X + 3 -29 X + 6 \ \end{flalign*} $$