Sagot :
9 * x = 9x
9 * 5 = 45
9 * 8y = 40y
9x + 45 + 40y
9x + 40y + 45
9 * 5 = 45
9 * 8y = 40y
9x + 45 + 40y
9x + 40y + 45
You distribute the 9 to what's inside the parentheses
9*x=9x
9*5=45
9*8y=72y
9x+72y+45
9*x=9x
9*5=45
9*8y=72y
9x+72y+45