book Maths Puzzle Numerical Ability

How do I Solve the equation by first clearing the fractions
Here's the problem:
5/6s+2/9=-7/12

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book Other Question

absolute value of 2y + 1/2 < 1/4 the volume of a cone is given by

v=(1/3)pr2h
where v is the volume,p is about 3.14,r is the radius of the