5-z 18 -5z
----- = -------- mnożę na krzyż
8 12
12(5-z) = 8(18-5z)
60 - 12z = 144 - 40z
-12z + 40z = 144-60
28z = 84 /:28
z= 3
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5-z 18 -5z
----- = -------- mnożę na krzyż
8 12
12(5-z) = 8(18-5z)
60 - 12z = 144 - 40z
-12z + 40z = 144-60
28z = 84 /:28
z= 3