x - 2 = - 7 - 13
x - 2 = - 20
x = ( - 20 ) + 2
x = - 18
Vậy x = - 18
x - 2 = -7 - 13
x - 2 = - 20
x = -20 + 2
x = -18
x - 2 = -7 -13
\(\Rightarrow\)x - 2 = -20
\(\Rightarrow\)x = -20 + 2 = -18
vậy x = -18
\(x-2=-7-13\)
\(x-2=-20\)
\(x=-20+2\)
\(x=-18\)
\(x-2=-7-13\)
\(\Leftrightarrow x-2=-7+\left(-13\right)\)
\(\Leftrightarrow x-2=-\left(\left|-7\right|+\left|-13\right|\right)\)
\(\Leftrightarrow x-2=-\left(7+13\right)\)
\(\Leftrightarrow x-2=-20\)
\(\Leftrightarrow x=-20+2\)
\(\Leftrightarrow x=-\left(\left|-20\right|-\left|2\right|\right)\)
\(\Leftrightarrow x=-\left(20-2\right)\)
\(\Leftrightarrow x=-18\)
X -2=-7-13
X -2=-20
X =-20+2
X = -18