exam Maths Puzzle Numerical Ability

3(12b + 6c) - 7(4b - 5c) simplify expression

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exam Other Question

How do I solve the equation and find the property I use at each step to simplify the equation
4x + 11 = (5x + 34)/2 f(x)=2x^2-x+7 ; g(x)=x-1

find (f-g)(x)

I don't know if I am to just subtract or put in the proper way. I am lost.