Question

1000x+1500(30-x)=39000 Срооочноо

Answer 1

$1000x + 45000 - 1500x = 39000 \\ - 500x + 45000 = 39000 \\ - 500x = 39000 - 45000 \\ - 500x = - 6000 \\ x = 12$

Answer 2

1000x+1500(30-x)=39000
1000х+45000-1500х=39000
-500х+45000=39000
-500х=39000-45000
-500х=-6000
х=6000:500
х=12
Ответ:12