book Maths Puzzle Numerical Ability

Solve the equation. Beware of extraneous solutions.
((15x/9)/x)+ ((9x+7/(x+2))= 9

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book Other Question

The graph of the basic exponential function (y = bx) has
two distinctive characteristics:

a) having a y intercept of (0,1), and

b) having a horizontal asymptote of y=0. Give the missing numerator: 3x-1 /4=?/28