A)13-5x=3
5x=13-3
5x=10
x=10:5
x=2
B)2(3x-5)-36=42
2(3x-5) =42+36
2(3x-5) =78
3x-5 =78:2
3x-5 =39
3x =39+5
3x =44
x =44:3
x =44/3
C)27:(x-31)=9
x-31 =27:9
x-31 =3
x =3+31
x =34
Bn k cho mik nha!!!!!
a) 13 - 5x = 3
5x = 10
x = 2
b) 2(3x - 5) - 36 = 42
6x - 10 - 36 = 42
6x = 42 + 10 + 36
6x = 88
x = 88/6 = 44/3
c) 27 : ( x-31)=9
x - 31 = 27 : 9
x - 31 = 3
x = 31 + 3 = 34