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M-am incurcat la ceva foarte foarte simplu pls help

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


Răspuns :

X:2+(105-275:11):4=28
x:2+(105-25):4=28
x:2+80:4=28
x:2+20=28
x:2=28-20
x=8x2
x=16

X:2+(105-25):4=28
X:2+80:4=28
X:2+20=28
X:2=8
X=16