book Maths Puzzle Numerical Ability

Perform each indicted operation

4x^3 - (2x^3 + 3x)+ (7x^2 - 5x)

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book Other Question

My daughter is having problems with 2 step inequalities when it involves a fraction. Please help solve -x/5 + 2 >3. Thank you very much. I need help with a word problem please.
I paid $30.00 for 2 lawn chairs of different quality. At the same prices, 3 of the cheaper chairs would have cost $3.00 less than 2 of the better ones. Find the cost of each chair.
Thank you,
M.D.