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3(5z-7) - 2(9z-11) = 4(8z-13)-17
=> 15z -21 -18z+22 = 32z - 52 -17
=> -3z +1 = 32z- 69
=> 32z + 3z = 69+1
=> 35z = 70
=> z= 2
=> 15z -21 -18z+22 = 32z - 52 -17
=> -3z +1 = 32z- 69
=> 32z + 3z = 69+1
=> 35z = 70
=> z= 2
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