Răspuns:
27:[4+(3-m)x2+1]=2+1
27:[4+(3-m)x2+1]=3
4+(3-m)x2+1=27:3
4+(3-m)x2+1=9
(3-m)x2+1=9-4
(3-m)x2+1=5
(3-m)x2=5-1
(3-m)x2=4
3-m=4:2
3-m=2
m=3-2
m=1
Explicație pas cu pas: