EXPRESSION contains BRACKETS ((), {}, []) we have first to solve or SIMPLIFY the bracket followed by ‘order’ (that MEANS powers and ROOTS, etc.), then division, multiplication, addition and subtraction from left to rightCalculation:(49/8) ÷ [(21/4) ÷ (3/7) of (1/2)] - [8 × (2/3) ÷ (4/5) of (5/3)]⇒ (49/8)/[(21/4)/(3/14)] - [8 × (2/3)/(4/3)]⇒ [(49/8)/(49/2)] - (8 × (1/2))⇒(1/4) - 4⇒ -15/4