Решить уравнения. 5(14+b)=170 27(n-27)=27 (21-z): 21=0 44: (c+44)=1 3x+4x-2-5x=0

1)5*14+5b=170
70+5b=170
5b=170-70
5b=100
b=100÷5
b=20
2)27n-27*27=27
27n-729=27
27n=27+729
27n=756
n=756÷27
n=27

14+b+170÷5
14+b=34
b=34-14
b=20

n-27=27÷27
n-27=1
n=27+1
n=28

21-z=21×0
21-z=0
z=21-0
z=0

c+44=44×1
c+44=44
c=44-44
c=0

7x-2-5x=9
7x-5x=2x
2x-2=9
2x=9+2
2x=11
x=11÷2
x=5.5