7x+1 = 21-9x
7x+9x = 21 - 1
16x=20
x=[tex]20 \\ 16[/tex]
x= [tex]5 \\ 4[/tex]
1+3x = 3+2x
3x-2x=3-1
x=2
10+x= -10-x
x+x= -10-10
2x= -20
x= [tex]-20 \\ 2[/tex]
x= [tex]-10 \\ 2[/tex]
x= 5
5x+2=3x+1
5x-3x= 1-2
2x=1
x= [tex]1 \\ 2[/tex]
x+1+2x+2=3
x+2x=3-2-1
3x=0
x=3
x+1=13
x=13-1
x=12
Asta e raspunsul complet ;) Sper ca e bine :)