Răspuns:
[tex]21+124 569:9-2a-107 = 6 737\\\\21+124 569:9-2a = 6 737+107\\\\124 569:9-2a = 6 844-21\\\\13 841-2a = 6 823\\\\2a = 13 841-6 823\\\\2a = 7 018\\ \\a=7018:2\\\\a = 3 509[/tex]
[tex](18b-1 278):149=36\\\\18b-1 278 = 36*149\\\\18b = 5 364+1 278\\\\18b = 6 642 \\\\b=6642:18\\ \\b = 369[/tex]
[tex][(c+41+56):2-20]:10 = 3\\\\(c+97):2-20 =3*10\\\\(c+97):2 = 30+20\\\\c+97 = 50*2\\\\c = 100-97\\\\c = 3[/tex]