Ответ:
(3,7x+15y)+(-4,6y-12x)=3,7x+15y-4,6y-12x=-8,3x+10,4y
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Ответ:
(3,7x+15y)+(-4,6y-12x)=3,7x+15y-4,6y-12x=-8,3x+10,4y