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Section 10C Study Guide #1 – 4 One-step addition and subtraction equations b – (-4) = 16 12 + c = -15 #4 – 8 One-step multiplication and division equations 4x = 28 x/3 = 9 #9 – 12 Two-step integer equations 3x + 11 = 8 -9x +(-3) = 33 #13 – 18 Writing integer equations to solve word problems The temperature changed –20 degrees in 8 hours, and was then 15 degrees. What was the temperature before the change?