book Maths Puzzle Numerical Ability

Please help.
Add and express in simplest form.

4x/x^2-18x+72 + 4/x-6

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book Other Question

7.23x^2 + 11.67x + 19.49 = 32.35
im having major trouble. can you please help me out with this one? Thank you Write an equation in slope-intercept form of a line that passes through the points, (2, -2) and is perpindicular to the graph of x+5y=6