book Maths Puzzle Numerical Ability

Simplify: (-3)(6)(-2) - 8 + 4 + 3(6)

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hello, I need help for my h.w , I dont get it and im trying but it doesnt make sense, ill be happy to receive help, thank you :)

"if the area of a rectangle is 12 and if the bas 12y+3-9=12y-36 cant figure out how to do this kind of problem can you help