exam Maths Puzzle Numerical Ability

-5(3x-4)-(6x-1)

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exam Other Question

which of the following is a step in the solution of the given equations?
x^2+y^2=65
(1/2)xy=14
a. x+y=121
b.x^2-11x+28=0
c.x^2+2xy+y^2=79
d.11+-(121+112)^(1/2)
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2
[k]>2.5