book Maths Puzzle Numerical Ability

y=(2/3)x-5

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Please help solve this equation. thank-you

(6x7 + 9x4)
___________ =54

(2x6 + 6x2)

this is a fraction that equal 54
2x-9 3
--- = --
4-4x 4


i don't get this even when the techer explains it to me.