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

w
- +7=2h+2
2

^that is supposed to be w over 2

I hate fractions, they confuse me soo much, getting started is usually where I get confused... THANKS! y=2x^2 - 5x - 12 by graphing

y=2(125)^2 - 5(125)-12 x y=2x^2
3.13 -6.25 - 7
3.13-6.75