9x+63=18+45
9x+63=63
9x=63-63
9x=0
=> x = 0.
Đúng nhé TRANG!
9x + 63 = 18 + 45
9x + 63 = 63
9x = 63 - 63
9x = 0
x = 0 : 9
x = 0
9x + 63 = 18 + 45
9x + 63 = 63
9x = 63 - 63
9x = 0
x = 0 : 9
x = 0
9x + 63 = 18 + 45
9x + 63 = 63
9x = 63 - 63
9x = 0
x = 0 : 9
x = 0
9x + 63 = 18 + 45
9x + 63 = 63
9x = 63 - 63
9x = 0
x = 0 : 9
x = 0