0.8*(9+2х)=0.5*(2-3х)

Question

0.8*(9+2х)=0.5*(2-3х)

Answer 1

0.8·(9+2х)=0.5·(2-3х)

8·(9+2х) = 5·(2-3х)

72 +16х = 10 -15х

31х = -62

х = -62/31

х = -2

 

Answer 2

0.8*(9+2х)=0.5*(2-3х)

7,2+1,6x=1-1,5x

1,6x+1,5x=1-7,2

3,1x=-6,2

x=-6,2/3,1=-2

Ответ: -2