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------------------[-7]---------------------[4]---------------------
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Ответ. [-7;4]
Целые решения : - 7; -6; -5; -4; -3; -2; -1; 0; 1; 2; 3; 4
Их сумма -7+(-6)+(-5)+(-4)+(-3)+(-2)+(-1)+0+1+2+3+4=--18