X x 2 - 100 = 1000
x x 2 = 1000 - 100
x x 2 = 900
x = 900 : 2
x = 450
x : (50 x 5)= 9
x : 250 = 9
x = 9 x 250
x = 2250
\(x:\left(50\times5\right)=9\)
\(\Leftrightarrow x:250=9\)
\(\Leftrightarrow x=9\times250\)
\(\Leftrightarrow x=2250\)
x : ( 50 × 5 ) = 9
x : 250 = 9
x = 9 × 250
x = 2250