- Solving equations, Solving pairs of equations, Undefined fractionChoice D
$\frac{b+c}{d}$ is undefined, therefore

$$ d = 0 $$

$$ abc=d $$

$$ ac=1 $$

$$ => ac \cdot b=d $$

$$ =>1 \times b = 0 $$

$$ => b=0 $$

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