exam Maths Puzzle Numerical Ability

Can you help me solve this equation please?

1. 9/x = 4/3x + 1

x = ?

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exam Other Question

please help me solve x(x+5)=0 thank you so much Please help me to answer this question "What is x and y for the term 9x+y=10 and x+4y=5 using the substitution?" And please teach how to solve it step by step... Please... <>