Răspuns:
2x=9-5=>2x=4<=>x=2
-7x=-11-3<=>-7x=-14<=>x=2
8+3x=4x-4<=>-x=-12<=>x=12
13-x-2=2x+17<=>-3x=17+2-13<=>-3x=6<=>x=-2
Pt utima nu stiu sigur rezolvarea, dar poti descarca aplicatia Photomath si ea ti-l rezolva.
