Question

(- x + 31 ) - 39 = 69 +11

Answer 1

\(\left(-x+31\right)-39=69+11\Leftrightarrow-x+31-39=80\)

\(\Leftrightarrow\) \(-x=80+39-31=88\) \(\Leftrightarrow\) \(x=-88\) vậy \(x=-88\)

Answer 2

\(\left(-x+31\right)-39=69+11\)

\(\Leftrightarrow\left(-x+31\right)-39=80\)

\(\Leftrightarrow-x+31=80+39\)

\(\Leftrightarrow-x+31=119\)

\(\Leftrightarrow-x=119-31\)

\(\Leftrightarrow-x=88\Rightarrow x=-88\)

Answer 3

( -x + 31 ) - 39 = 69 + 11

( -x + 31 ) - 39 = 80

( -x + 31 ) = 80 + 39

-x + 31 = 119

-x = 119 - 31

-x = 88

x = -88

Answer 4

(-x+31)-39=69+11

-x+31=69+11+39

-x+31=119

-x=119-31

-x=88

\(\Rightarrow\)x=-88