<span>A(-7) ;B(-3) ; C(-1) ; D(4) ; E(6)
-----------------------------------------</span>
(x-87)-27=36
x-87=36+27
x-87=63
x=63+87
x=150
(x-87)-27=36
x-87-27=36
x-114=36
x=36+114
x=150
2m^-2n^-m+n=2(m^-n^)-(m-n)=2(m+n)(m-n)-(m-n)=(m+n)(m-n)(2-1)=
(m^-n^)*1=m^-n^
(30142+z):876=49
(30142+z)=49*876
(30142+z)=42924
Z=42924-30142
Z=12782
---------------------------
(30142+12782):876=49
=49