25 - (39 + x) = x - (13 - 39)
<=> 25 - 39 - x = x - ( - 26 )
<=> - 14 - x = x + 26
<=> - 14 - 26 = x + x
<=> - 40 = 2x
=> x = - 20
\(25-\left(39+x\right)=x-\left(13-19\right)\)
\(25-39-x=x-\left(-6\right)\)
\(-14-x=x+6\)
\(-x-x=6+14\)
\(-2x=20\)
\(x=20:\left(-2\right)\)
\(x=-10\)
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25 - (39 + x) = x - (13 - 19)
25 - 39 - x = x - 13 + 19
-x - x = -13 + 19 - 25 + 39
-2x = 20
x = 20 : (-2)
x = -10
25 - ( 39 + x) = x - (13 - 19)
25 - 39 - x = x - ( - 6 )
-14 - x = x + 6
- x - x = 6 + 14
- 2x = 20
x = 20 : ( - 2)
x = - 10