x+12=-5-x
\(\Leftrightarrow2x=-17\)
\(\Leftrightarrow x=-\frac{17}{2}\)
Vậy ..
\(x+12=-5-x\)
\(\Rightarrow x+x=-12+5\)
\(\Rightarrow2x=-7\)
\(\Rightarrow\)Vô lý
x + 12 = -5 - x
x + x = -5 - 12
2x = -17
x = (-17) : 2
x = -8,5
Vậy x = -8,5
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