book Maths Puzzle Numerical Ability

directions: find all the roots of each equation.

2x^3+3x^2-6x-9=0

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book Other Question

Please assist me with the basic equation principles. This one is called addition property of equality, which also confounds me. If you could explain the basic principles, I could p 1/9(2m-16)=1/3(2m+4)