exam Maths Puzzle Numerical Ability

-7x(3xy+2y-4x)

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exam Other Question

i dont understand this 4/j+k + 2/k it's rational expression 1/3 + (-5/6) + (-1/2) OK I have no idea about these at all. The parenthesis are actually "longer" than a normal parenthesis. I have read all about these and nothing is sinking in for some reason, can someone help me please?