75 + 12 – 3 = 12 – 5 + 714 = 14LHS is equal to RHSIf we interchange 4 and 7,5 + 3 × 6 – 4 ÷ 2 = 7 × 3 – 10 ÷ 2 + 45 + 18 - 2 = 21 – 5 + 421 = 20LHS is not equal to RHS.Hence, we NEED to interchange 6 and 4 in order to get the given equation CORRECT.