Răspuns :
5(14+b)=170
70+5b=170
5b=170-70
5b=100
b=20
25(n-27)=27
25n-675=27
25n=27+675
25n=702
n=28,08
(21-z)/21=0
21-z=21
-z=1/-1
z=1
3x+4x-2-5x=0
2x=2
x=1
70+5b=170
5b=170-70
5b=100
b=20
25(n-27)=27
25n-675=27
25n=27+675
25n=702
n=28,08
(21-z)/21=0
21-z=21
-z=1/-1
z=1
3x+4x-2-5x=0
2x=2
x=1