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Sagot :


                                          (7z - 1) / 2  =  3z - 2

Multiply each side by  2 :    (7z - 1)  =  2 (3z - 2)

                                           7z - 1  =    6z - 4

Subtract  6z  from each side:    z - 1 =      -4

Add  1  to each side:                z = -3