If a+b+c=18,b+c+d=22,c+d+a=26,b+a+d=30 find a+b+c+d
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a+B+c = 18
B+c+d=22
a+c+d=26
a+B+d=30
Add all equations to get
3(a+B+c+d)=96
so a+B+c = 32
B+c+d=22
a+c+d=26
a+B+d=30
Add all equations to get
3(a+B+c+d)=96
so a+B+c = 32
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