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x : 2 + (105 -275 :11 ):4 = 28

Răspuns :

x:2+(105-25)=28x4
x:2+80=112
x:2=112-80
x:2=32
x=32x2
x=64
x:2=28-(105-25):4⇒x:2=28-20⇒x=8*2=16