\(100.x+\left(10+2\right)=212\)
\(\Leftrightarrow100x+\left(10+2\right)=212\)
\(\Leftrightarrow10x+12=212\)
\(\Leftrightarrow10x=200\)
\(\Leftrightarrow x=20\)
100 . x + ( 10 + 2 ) = 212
100 . x + 12 = 212
100 . x = 212 - 12
100 . x = 200
x = 200 : 100
x = 2
100.x+12=212
100.x=200
x=200:100
x=2
ok
100 . x + ( 10 + 2 ) = 212
100 . x =212 -(10+2)
100 . x =200\(\div\)100
x =2
100 . x + ( 10 + 2 ) = 212
100 . x + 12 = 212
100 . x = 212 - 12
100 . x = 200
x = 200 : 100
x = 2
100 . x + (10 + 2) = 212
100 . x + 12 = 212
100 . x = 200
x = 2
100 . x + ( 10 + 2 ) = 212
100 . x + 12 = 212
100 . x = 212 - 12
100 . x = 200
x = 200 : 100
x = 2
100 . x + 12 = 212
100 . x = 212 - 2
100 . x = 200 x = 200 : 100 x = 2