exam Maths Puzzle Numerical Ability

Twice the square of a positive integer is 12 more than 10 times that integer. What is the integer?

10(x)^2 = x + 12


I know I have to have a formula first. Am I on the right track for the formula in order to solve this problem?

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exam Other Question
The first angle of a triangle is three times the measure of the third angle. The second angle is five less that the third angle. Find the measure of each angle. Find the factor the sum of two cubes:
x^3+8