Question

Решите уравнение 5 − 2x = 11 − 7(x + 2) .

Answer 1

5-2х=11-7х-14

-2х+7х=11-14-5

5х=-8

х=-1.6

Answer 2

$5-2x=11-7(x+2)$

 

$5-2x=11-7x-14$

 

$5-2x=-3-7x$

 

$7x-2x=-3-5$

 

$5x=-8$

 

$x=-8:5$

 

$x=-frac{8}{5}=-1,6$

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$5-2cdot(-1,6)=11-7cdot(-1,6+2)$ (это проверка)

 

$5+3,2=11-7cdot0,4$

 

$8,2=11-2,8$

 

$8,2=8,2$