exam Maths Puzzle Numerical Ability

Twice the square of a positive integer is 35 more than 9 times that integer. What is the integer?

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i having trouble figuring out how to get the LCD and converting each expression to an equivalent expression with the LCD the denominator for---

6x/y^2 and 3/xy^2z^4 y=0.06x^2+0.012x+8
y=0.912x+5

I know it goes to
0.912x+5=0.06x^2+0.012x+8

I am just not sure how to come up with x? any help would be appreciated!!
Thank you