1. (х-4)+(х+6)=4;
х-4+х+6=4;
2х+2=4;
2х=2;
х=1.
2. (х-5)-(5-3х)=2;
х-5-5+3х=2;
4х-10=2;
4х=12;
х=3.
3. 23-(х+5)=13;
23-х-5=13;
-х+18=13;
-х=13-18;
-х=-5;
х=5.
