Question

(1/2)х + (1/4)х + (1/7)х + 3 = x

Answer 1

(1/2)х + (1/4)х + (1/7)х + 3 = x
(1/2)х + (1/4)х + (1/7)х-x= -3
x(1/2+1/4+1/7 -1)= -3
x( (14+7+4 -28)/28)= -3
x(-3/28) = -3
x=28*3/3
x=28

Answer 2

Большое спасибо Юль .