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(x:4+5) *3-1=20, dau coroana

Răspuns :

(x:4+5)x3=21 /+5
x:4+5=7 /-5
x:4=3 /x4
x=12
[x:4+5] ori 3-1=20
x:9 ori 2=20
x:9=20-2
x:9=18
x=18:9
x=2