(1)(m+n)^-4m(m+n)+4m^(2)a^+2a(b+c)+(b+c)^(3)4+12(x-y)+9(x-y)^(4)(a-b)(x-y)-(b-a)(x+y)

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(1)(m+n)^-4m(m+n)+4m^(2)a^+2a(b+c)+(b+c)^(3)4+12(x-y)+9(x-y)^(4)(a-b)(x-y)-(b-a)(x+y)

(1)(m+n)^-4m(m+n)+4m^(2)a^+2a(b+c)+(b+c)^(3)4+12(x-y)+9(x-y)^(4)(a-b)(x-y)-(b-a)(x+y)
(1)(m+n)^-4m(m+n)+4m^
(2)a^+2a(b+c)+(b+c)^
(3)4+12(x-y)+9(x-y)^
(4)(a-b)(x-y)-(b-a)(x+y)

(1)(m+n)^-4m(m+n)+4m^(2)a^+2a(b+c)+(b+c)^(3)4+12(x-y)+9(x-y)^(4)(a-b)(x-y)-(b-a)(x+y)
1.[(m+n)-2m]
2.[a+(b+c)]
3.[2+(x-y)]
4.(a-b)(x-y+x+y)
=2x(a-b)