exam Maths Puzzle Numerical Ability

This problem seems to hace so mny letteres and numbers that I am loosing myelf in the equation. I am having a hard time just figuring out the LCD.

the equation is x/7x+7 + x+8/1

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exam Other Question
write an equation of the line that is parallel to the given line and that passes through the given point.
x+y=3 and the points are (5,4). for a line to be parallel, it has to hav a^4-15a^2+56