A student showed work to solve the equation 6(3d + 1) + 30 = 9d – 7.
Step One 18d + 1 + 30 = 9d – 7
Step Two 18d + 29 = 9d – 7
Step Three 9d + 29 = –7
Step Four 9d = –35
Step Five d = –5
The student made a mistake in Step One. Choose the correct equation for Step One.
