Упростите выражение
a)(5m-13n)+(11n+23m)
б)-(2a+8c)+(7a-11a)
в)-3b(7-b)-4b(3b+8)
г)7x(2x-7y)-(y-9x)(3x+5y)
д)(4z-3)2+(3z+4)2
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