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Mathematics
Jillian Thornton
5 November, 09:56
A+b=240
c+d=500
d-b+c=455
a+c=215
d?
+3
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1
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First Mate
5 November, 11:09
0
A+b=240 = > - a - b = - 240; but, a+c=215 = > - b + c = - 240 + 215 = - 35; but, d-b+c=455 = > d = 455 + 35 = > d = 490.
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