- 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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