Question

aflati nr natural x stiind ca 2 x(x+7)-14 =28

Answer 1

2(x+7)=28+14
2(x+7)=42
x+7=42:2
x+7=21
x=21-7
x=14

Answer 2

$2*(x+7)-14 =28$
$2*(x+7)=28+14$
$2*(x+7)=42$
$x+7=42:2$
$x+7=21$
$x=21-7$
$\boxed{x=14}$