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b)(56ab+48a^2-24b^2):(-8)=-7ab-6a^2+3b^2
c)(-6t^2-3t-9):2/3=(-6t^2-3t-9)*3/2=9t^2-4,5t-13,5
d)(5mp+6m-2p):(0,1)=(5mp+6m-2p):(-1/10)=(5mp+6m-2p)*(-10)=-50mp-60m+20p
e)=4x^2+8x-2
f)=-5tr-3t-6r