x + 30 x 5 = 600
x + 150 = 600
x = 600 - 150
x = 450
nha bn
x + 30 x 5 = 600 + 0
x + 150 = 600
x = 600 - 150
x = 450
x+ 30 X 5 = 600
x + 150 = 600
x = 600 - 150
x = 450
x + 30 x 5 = 600 + 0
x + 30 x 5 = 600
x + 30 = 600 : 5
x + 30 = 120
x = 120 - 30
x = 90