Question

0.6(x+7)-0.5(x-3)=6.8

Answer 1

0.6(x+7)-0.5(x-3)=6.8

0.6x+4.2-0.5x-(-1.5)=6.8

0.6x+4.2-0.5x+1.5=6.8

0.6x-0.5x=6.8-1.5-4.2

0.1x=1.1

x=11

 

Проверка:

0.6(11+7)-0.5(11-3)=6.8

0.6*18-0.5*8=6.8

10.8-4=6.8

6.8=6.8

 

Answer 2

$0,6(x+7)-0,5(x-3)=6,8$

 

$0,6x+4,2-0,5x+1,5=6,8$

 

$0,1x+5,7=6,8$

 

$0,1x=6,8-5,7$

 

$0,1x=1,1$

 

$x=1,1:0,1$

 

$x=11$

_________________________________________________________

$0,6cdot(11+7)-0,5cdot(11-3)=6,8$ (это проверка)

 

$0,6cdot18-0,5cdot8=6,8$

 

$10,8-4=6,8$

 

$6,8=6,8$