exam Maths Puzzle Numerical Ability

HI!
please help me

If x (a kite symbol comes between) y=2x-5, find x (kite symbol) y if x=5 and y=-7

thanks for any help coming on my way

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exam Other Question

if (6t+7a)/4=t, then what is 4t in terms of a?
the answer is -14a i would like to know how to get that answer.
thank you Find length x in each triangle. Express your ansewer in simplified radical form

12,x, 8