book Maths Puzzle Numerical Ability

(3x-2)(4x exponent3 - 2x exponent3 -2x +7x-5)

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a parent who has not had to use this math since high school and my son came to me for help, Help!!! heres two types of problems he has to do 3(6+4) = 3(___)+ 3(4) and my son has to do some simplifys 12(x + 2) or 9 (p - 6) what would coordinates be for x=3y?