Răspuns:
o sa rezolv prima coloana din fiecare exercitiu deoarece se rezolva la fel
7) x+5=-4
x=-4-5=>x=-9
x-8=-2
x=-2+8=>x=6
-3=-1+x
-3+1=x=>x=-2
-9x=27=>x=27:(-9)=>x=-3
_____________
8) 2x+1=-7
2x=-7-1=>x=-8:2=>x=-4
3x+24=0=>x=-24:3=>x=-8
3+2x=-7
2x=-7-3=>x=-10:2=>x=-5
1-2x=-7
-2x=-7-1=>x=-8:-2=>x=4
____________
9)2x+5=x+6
2x-x=6-5
x=1
4x+9=3x+17
4x-3x=17-9
x=8
2x+9=7+x
2x-x=7-9
x=-2
3-2x=-x+6
-2x+x=6-3
-x=3=>x=-3
atentie la regula semnelor
