100X(30-x)=200 помогите

Question

100X(30-x)=200 помогите

Answer 1

3000-100x=200
3000-200=100x
2800=100x
2800/100=x
28=x

Comments

спасибо

Answer 2

3000-100х = 200
-100х = 200-3000
-100х = -2800
х = -2800 / -100
х = 28