exam Maths Puzzle Numerical Ability

63. -6x-3[2x-5(x+8)]-6 and 65. 1/2(x+3)+1/3(3x+6) these two problems i am not sure how these are worked out.

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exam Other Question

an elevator at a construction site has a maximum capacity of 2500 pounds. if the elevator operator weights 160 pounds and each cement bag weighs 60 pounds, how many bags of cement can be safely lifted on the elevator in one trip? d) T F The equation x^2 + 5y = 18 is called a linear equation.