$-720+3612:{(-151-2.[120+1740:(-15-25)])}$
$=-720+3612:{(-151-2.[120+1740:(-40)])}$
$=-720+3612:{(-151-2.[120-43,5])}$
$=-720+3612:{(-151-2.76,5)}$
$=-720+3162:{(-151-153)}$
$=-720+3162:-304$
$=-720+\dfrac{-1581}{152}$
$=\dfrac{-109440}{152}+\dfrac{-1581}{152}=\dfrac{-111021}{152}$