exam Maths Puzzle Numerical Ability

Please help me solve this equation:

1-7/x-18/x^2=0

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exam Other Question

on a trip, palmer s. friedrich drove at a rate of 55 mph. he desided to return by a route that was 5 miles longer. his rate returning was 45 mph. if it took him 1 hour longer returning, how long was the second route?
for the data given, find the equation of the line in its best fit.
x=2,3,7,8,10
y=5,6,5,6,6