Răspuns :
Răspuns:
3x=21
x=7
x+1=1
x=1-1=0
x-3=24
x=24+3=27
3x+1-5=3-1-x
3x-4=2-x
3x+x=2+4
4x=6
x=6/4=3/2
x+2/3=x+1/2
x+2/3-x-1/2=0
2x+4-3x-3=0
-x= - 1
x= 1
Explicație pas cu pas:
3x=21
x=21:3
x=7
x+1=1/2
x+2/2=1/2
x=-1/2
x-3=24
x=24+3
x=27
3(x+1)-5=3-(1+x)
3x+3=3-1-x
3x+3=2-x
4x=-1
x=-1/4
(x+2)/3=(x+1)/2
2(x+2)=3(x+1)
2x+4=3x+3
4-3=3x-2x
1=x
x=1
Succes!