# Multi-equation Solver using Standard Algebra

Algebra Level 1

$\begin{cases} a+b=17 \\ c+d=20 \\ a-d = \dfrac{d-c}2 = 1 \end{cases}$

Given that $$a,b,c$$ and $$d$$ are numbers satisfying the system of equations above, find $$\dfrac{b+c}{a-b}$$.

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