(х - 5)(х + 2) - (х - 7)(х + 4)=х^2-3х-10-(х^2-3х-28)=х^2-3х-10-х^2+3х+28=
18
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(х - 5)(х + 2) - (х - 7)(х + 4)=х^2-3х-10-(х^2-3х-28)=х^2-3х-10-х^2+3х+28=
18