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  • 2017 December(A10) Math Question 3

    Ratios, Proportions, Percentages, Fractions

    - Solve Algebraic Expressions

    Choice A

    k=75j+54=40k=\frac{7}{5}j+54=40k=57​j+54=40 75j=40−54\frac{7}{5}j=40-5457​j=40−54 75j=−14\frac{7}{5}j=-1457​j=−14 7j=−14×57j=-14 \times 57j=−14×5 j=−14×5÷7j=-14 \times 5 \div 7 j=−14×5÷7 ⇒j=−10\Rightarrow j=-10⇒j=−10

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