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a2+b2+c2+4a-8b-14c+69=0 (a²+4a+4)+(b²-8b+16)+(c²-14c+49)=0 (a+2)²+(b-4)²+(c-7)²=0 a= -2,b=4,c=7 a+2b-3c= -2+2x4-3x7= -2+8-21= -15
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