a= 7

b= -1

c= -2

d= -3

b=(a+b+c+d)-(a+c+d)=1-2=-1

c=(a+b+c+d)-(a+b+d)=1-3=-2

d=(a+b+c+d)-(a+b+c)=1-4=-3

a+b+c+d=1

=>a+(-1)+(-2)+(-3)=1

=>a+(-6)=1

=>a=7

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