Question

Нужна срочно помощь:
13+3.2Х+0.4Х=40

Answer 1

3.2x+0.4x=40-13
3.6x=27
x=27:3.6
x=270:36
x=7.5

Answer 2

13+3,6х=40
3,6х=40-13
3,6х=27
х=27:3,6
х=7,5