a) 7 (x+2)- 2 (8-4)=6(x+2)-9
7 (x+2)- 2 ×4=6(x+2)-9
7 (x+2)- 8=6(x+2)-9
7x+14-8=6x+12-9
7x+6=6x+3
7x-6x=3-6
[tex].[/tex]
Răspuns:
Explicație pas cu pas:
7*x+7*2-2*8+2*4=6*x+6*2-9
7x+14-16+8=6x+18-9
7x-6x=16-14-8+18
x=12
stim ca (-2)(-4)=+2*4=8
