book Maths Puzzle Numerical Ability

Could you please help me solve the following Question:
{{{log(2,x)+log(3,(x+1))=4}}}
I have tried many ways of solving this including changing bases, but they always seem to end

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book Other Question

6x-1 divided by 5

minus 2x divided by 3

equals 3


solve x and check your result
x squared -3x +9