book Maths Puzzle Numerical Ability

Getting this slowly! But getting it thank God! Thank you for helping me lose my fear of Algebra. What would be your thoughts on this one?
"Solve 81x^3+36^2=-4x"?
Have a great day. Thanks again.

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book Other Question
A standard limousine will carry 6 adults.If 85 students want to take limousines to their junior-senior banquet,how many must they reseve?(the possibilities are 14, 16, 15,or none of these) please help me understand this...

1/4 c + 2 = 3/4
^^^ ^^^
these are fractions.

please explane to me how its done... th