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4(4z-5) = 2(z+21)
16z - 20 = 2z + 42
16z - 2z = 42 + 20
14z = 62
z = 62/14
z = 31/7 ~ 4,43
__________________x4
16z - 10 = 4z + 21
16z-4z = 21 + 10
12z = 31
z = 31 : 12
z = 2,58