`71- (33+x)=26`
`=> 33+x = 71-26 = 45`
`=> x =45 -33 = 12`
Vậy `x=12`
\(\Leftrightarrow-\left(33+x\right)=26-71\\ \Leftrightarrow-33-x=-45\\ \Leftrightarrow x=12\)
`=> 33 + x = 45`
`-> x = 12`.
\(71-\left(33+x\right)=26\)
\(\Rightarrow33+x=71-26\)
\(\Rightarrow33+x=45\)
\(\Rightarrow x=45-33\)
\(\Rightarrow x=12\)
\(\Rightarrow33+x=71-26\)
\(\Rightarrow33+x=45\)
\(\Rightarrow x=45-33\)
\(\Rightarrow x=12\)