10x+13-43-3x=12
(10-3)x-30=12
7x=12+30
7x=42
x=42:7
x=6
(10x-7x)+13-43=12 (mk k xuốg dòng đc) (3x+13)-43=12 3x+13=12+43
3x+13=55 3x=55-13=42 x=42:3=14
10x-3x+13-43=12
x(10-3)+13-43=12
x.7=12-13+43
x.7=42
x=42:7
x=6
kbn nha
10x + 13 - 43 - 3x = 12
( 10 - 3 ) x - 30 = 12
7x = 12 + 30
7x = 42
x = 42 : 7
x = 6
10x + 13 - 43 - 3x = 12
( 10 - 3 ) x - 30 = 12
7x - 30 = 12
7x = 12 + 30
7x = 42
x = 42 : 7
x = 6