a+b=240,c+d=500,d-b+c=455,a+c=215, d=?
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d=500-c
d-b+c=455
500-c-b+c=455
b=45
a=240-b
a=240-45
a=195
d-b+c=455
c=215-a
d-45+215-a=455
d-45+215-195=455
d=470
d-b+c=455
500-c-b+c=455
b=45
a=240-b
a=240-45
a=195
d-b+c=455
c=215-a
d-45+215-a=455
d-45+215-195=455
d=470
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