Răspuns :
(12X+24):12-5=1
(12X+24):12=5+1
(12X+24):12=6
12X+24=6 x 12
12X+24=72
12X=72-24
12X=48
X=48:12
X=4
(12X+24):12=5+1
(12X+24):12=6
12X+24=6 x 12
12X+24=72
12X=72-24
12X=48
X=48:12
X=4