Răspuns :
12X + 13X + X37 + 4X2 = 1249
1×100+2×10+X×1 + 1×100+3×10+X×1 + X×100+3×10+1×7 +4×100+X×10+2×1 =1249
100+20+X+100+30+x +100×X+30+7+400+10×X+2 =1249
600+80+9+ 112×X = 1249
689+ 112×X = 1249 | - 689
112 × X = 560 | :112
X = 5
100+20+x+100+30+x+100x+30+7+400+10x+2=1249
689+112x=1249
112x=560
x=4
689+112x=1249
112x=560
x=4