(х-4)+(х+6)=4.
2х-4+х+6=4
3х+2=4
3х= 4-2
3х=2
х= 2/3
23-(х+5)=13
23-х+5=13
28-х=13
-х= 13-28
-х= -15
х=15
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(х-4)+(х+6)=4.
2х-4+х+6=4
3х+2=4
3х= 4-2
3х=2
х= 2/3
23-(х+5)=13
23-х+5=13
28-х=13
-х= 13-28
-х= -15
х=15
х+5=23-13
х+5=10
х=10-5
х=5
23-(5+5)=13
(5+5=10)в уме)
23-10=13
13=13