-13x-y+1+12x = -x-y+1; при x=-15; y=-3
-(-15)-(-3)+1=15+3+1=19
Ответ: 19
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-13x-y+1+12x = -x-y+1; при x=-15; y=-3
-(-15)-(-3)+1=15+3+1=19
Ответ: 19