Answer: a = 2 Subtract 9a from both sides. 9a and -9a then cancel out and 7a - 9a = -2a Divide both sides by -2 -2 and -2 cancels out -4/-2 = 2 leaving you with a = 2 To check your answer plug it in to wherever it says a. 9(2) - 4 = 7(2) 18 - 4 = 14 14 = 14 which is true.
