book Maths Puzzle Numerical Ability

i need help with this problem......
(2(x+7) / x-4) - 2 = 2x+20 / 2x+8

its from the text book... heath algebra 2 an integrated approach
pg. 546 #34

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what is the answer of 12a+4-10a 6y-7 is less than -2y + 13