7. Реши уравнения: x · 3 = 21; 15 : x = 5; 4 · x = 28; x − 17 = 46; 48 − x = 29; x − 13 = 26; x + 24 = 56; 37 + x = 70; x + 18 = 40.

x · 3 = 21, x = 21 : 3 = 7.

15 : x = 5, x = 15 : 5 = 3.

4 · x = 28, x = 28 : 4 = 7.

x − 17 = 46, x = 46 + 17 = 63.

48 − x = 29, x = 48 − 29 = 19.

x − 13 = 26, x = 26 + 13 = 39.

x + 24 = 56, x = 56 − 24 = 32.

37 + x = 70, x = 70 − 37 = 33.

x + 18 = 40, x = 40 − 18 = 22.

Ответ: 7; 3; 7; 63; 19; 39; 32; 33; 22.