exam Maths Puzzle Numerical Ability

-3-(7)/3-5 is the question. i am haveing trouble with the positive and negative. when you add and subtract and when it becomes multiplacation

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how do you simplify 4-3(4x-6) Please help me with question. I do not understand it at all. Thanks so much for your help.

Find the indicated outputs for f(x)=2xto the second power -2x
f(0)=
f(-1)=
f(2)=

thanks again for the help.