Question

Tìm số nguyên \(x\), biết : 

              \(11-\left(15+11\right)=x-\left(25-9\right)\)

Answer 1

.
11-(15+11)=x-(25-9)
11-26 =x-(25-9)
-15 =x-(25-9)
-15 =x-16
16+(-15) =x
1 =x

Answer 2

\(11-\left(15+11\right)=x-\left(25-9\right)\)

\(\Leftrightarrow11-26=x-16\)

\(\Leftrightarrow-15=x-16\)

\(\Leftrightarrow x=16-15\)

\(\Leftrightarrow x=1\)