book Maths Puzzle Numerical Ability

My son is having a problem solving the following equation.
m^3-5m=2m^2-3

I'm not sure how to handle the exponents so I get lost solving this with him. You're help is appreciate

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book Other Question

3x+2(x+5)=15 (3X Squared+5X+1)-(2x-3) Could you help me to solve this problem?

or The Solution Set for 3-x>7... I need an Algebra tutor if someone has the time... Thank you Amber