Answer :
1) 33+a=12a
33 = 11a
33/11 = a
a = 3
2) -6n+2=4n-5
2 = 10n-5
7=10n
n = 7/10
n = 0,7
3) 2.4b-7=b+15.4
2.4b=b+22.4
1.4b=22.4
b = 22.4/1.4
b = 16
33 = 11a
33/11 = a
a = 3
2) -6n+2=4n-5
2 = 10n-5
7=10n
n = 7/10
n = 0,7
3) 2.4b-7=b+15.4
2.4b=b+22.4
1.4b=22.4
b = 22.4/1.4
b = 16