7x+49=28+35
7x+49=63
7x =63-49
7x =14
x=14:2
x=7
7x + 49 = 28 + 35
7x + 49 = 63
7x = 63 - 49
7x = 14
x = 14 : 7
x = 2
7.x+49=28+35
7.x+49=63
7.x=63-49
7.x=14
x=14:7
x=2
7x + 49 = 28 + 35
7x + 49 = 63
7x = 63 - 49
7x = 14
x = 14 : 7
x = 2
7x+49=63
7x =63-49=14
x =14:7=2
Vậy x bằng 2 k mình nha