Multi-equation Solver using Standard Algebra

Algebra Level 1

{a+b=17c+d=20ad=dc2=1 \begin{cases} a+b=17 \\ c+d=20 \\ a-d = \frac{d-c}2 = 1 \end{cases}

Given that a,b,c,a,b,c, and dd are numbers satisfying the system of equations above, find b+cab. \frac{b+c}{a-b}.

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