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calculeaza
[(x*2):5=13


[(x:9):8]*7=140


Răspuns :

(x*2):5=13
x * 2 = 13 *5
x*2 = 65
x = 65:2 
x = 32,5


[(x:9):8]*7=140
(x:9):8= 140:7
(x:9):8= 20
x:9= 20*8
x:9=160
x=160*9
x=1440
(x * 2) : 5 = 13
2x = 13 * 5
x = 65 : 2
x = 32,5

[(x : 9 ) : 8] * 7 = 140
(x : 9) : 8 = 140 : 7
x : 9 = 20 * 8
x = 160 * 9
x = 1440