5+(х+4) =29 40-(9+х) =22 88-(х+5)=63 44-(14+х) =20 23+(8+х) =44 25 !

5+(x+4)=29
5+x+4=29
x=29-5-4
x=20

40-(9+x)=22
40-9-x=22
x=22-40+9
x=-9

88-(x+5)=63
88-x-5=63
x=63-8+5
x=-20

44-(14+x)=20
44-14+x=20
x=20-44+14
x=-10

23+(8+x)=44
23+8+x=44
x=44-23-8
x=13