Solve for a, b, c and d when {:((b+c,c...

Solve for a, b, c and d when
`{:((b+c,c+a),(7-d,6-c))={:((9-d,8-d),(a+b,a+b)):}`

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The correct Answer is:

a = 1,b = 2, c = 3, d = 4

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