book Maths Puzzle Numerical Ability

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

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book Other Question

Please help me to solve this one. Thank you.

You want to plant a small rectangular garden in your back yard. To keep out
animals, you will completely enclose the garden with w directions: find all the roots of each equation.

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