- Choice A
$$k=\frac{7}{5}j+54=40$$ $$\frac{7}{5}j=40-54$$ $$\frac{7}{5}j=-14$$ $$7j=-14 \times 5$$ $$j=-14 \times 5 \div 7 $$ $$\Rightarrow j=-10$$
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$$k=\frac{7}{5}j+54=40$$ $$\frac{7}{5}j=40-54$$ $$\frac{7}{5}j=-14$$ $$7j=-14 \times 5$$ $$j=-14 \times 5 \div 7 $$ $$\Rightarrow j=-10$$
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