book Maths Puzzle Numerical Ability

Hi there,

I don't get this problem with extraneous solutions at all! Could someone please help me work out this problem before class?
2m / 5 = 3m / 2

Thank you
AC

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book Other Question

let f(x)= 3xsquared - 1 and g(x) = 2x + 5

find f(g(-1)) and g(f(-1)) please tell me the proof for this question that Complex numbers and real Numbers are same numbers( I mean if we show complex numbres with C and real numbers with R we have : C~R )