Question

Помогите пожалуйста.

1. (15x+32)*4=368
2. (11x-31)*5=505
3. 5.2x-6.3=30.1
4. 8.6x-4.7=72.7

Answer 1

(15х+32)*4=368
60х+128=368
60х=368-128
60х=240
х=4
(11х-31)*5=505
55х-155=505
55х=505+155
55х=660
х=12