а) 31(17+х) = 2294
17+x = 74
x = 74 - 17 = 57
x = 57
b) (5x-7)*21 = 798
105x - 147 = 798
105x = 798 + 147
105x = 945
x = 9
в) 24x+6x-19 = 491
30x - 19 = 491
30x = 491+19
30x = 510
x = 17
г) (x-23):26 = 7
x-23/26 = 7
x-23 = 182
x=182+23 = 205
x = 205
а) 31(17+х) = 2294
17+x = 74
x = 74 - 17 = 57
x = 57
b) (5x-7)*21 = 798
105x - 147 = 798
105x = 798 + 147
105x = 945
x = 9
в) 24x+6x-19 = 491
30x - 19 = 491
30x = 491+19
30x = 510
x = 17
г) (x-23):26 = 7
x-23/26 = 7
x-23 = 182
x=182+23 = 205
x = 205