book Maths Puzzle Numerical Ability

can you please help me with {x+12y=68
{x=8y-12

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book Other Question

cubed root of 128 - cubed root of 54
can this problem be solved? I thought the radicals had to be the same. If it can be solved can you show me how?? I need understand each step involved and I have to solve each of the following quadratic equations by completing the square. Show all necessary steps involved in finding the soluti