x+900-1023=900
x+900=900+1023
x+900=1923
x=1923-900
x=1023
x + 900 - 1023 = 900
x + 900 = 1923
x = 1023
bậy: x =1023
x + 900 - 1023 = 900
x + 900 = 900 + 1023
x + 900 = 1923
x = 1923 - 900
x = 1023
x + 900 - 1023 = 900
=> x + 900 = 900 + 1023
=> x + 900 = 1923
=> x = 1923 - 900
=> x = 1023
KL : x = 1023
x + 900 - 1023 = 900
x + 900 = 900 + 1023
x + 900 = 1923
x = 1923 - 900
x = 1023
Tk mik mik tk lại cho nhá