Răspuns:
a) a × 14 + 244 = 1000
a × 14 = 1000 - 244
a × 4 = 756
a = 756 : 4
a = 189
b) [ ( a : 9 ) × 7 + ( 102 : 2 ) ] - 49 = 58
( a : 9 ) × 7 + 51 ) = 58 + 49
a : 9 × 7 + 51 = 107
a : 9 × 7 = 107 - 51
a : 9 × 7 = 56
a : 9 = 56 : 7
a : 9 = 8
a = 8 × 9
a = 72
c) 8 × a + 573 : 3 - 93 = 210
8 × a + 573 : 3 = 210 + 93
8 × a + 573 : 3 = 303
8 × a + 191 = 303
8 × a = 303 - 191
8 × a = 112
a = 112 : 8
a = 14