x : (123 - 124) = -13
123 - 124 = x : ( -13)
-1 = x : (-13)
x = ( -13) . ( -1)
x = 13
\(x\div\left(123-124\right)=-13\)
\(x\div\left(-1\right)=-13\)
\(x=-13\cdot\left(-1\right)\)
\(x=13\)
Vậy x = 13
\(x\div\left(123-124\right)=-13\)
\(x\div\left(-1\right)=-13\)
\(x=\left(-13\right)\times\left(-1\right)\)
\(x=13\)
Vậy x = 13