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3 October, 23:46

A+b=240

c+d=500

d-b+c=455

a+c=215

d?

+3
Answers (1)
  1. 4 October, 00:02
    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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