If you mean: 3x^2+12x+12 = 0 then it has two equal solutions of -2
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None because without an equality sign the given expression is not an equation.
x2 - 12x + 35
That looks like a linear equation (no quadratic or higher terms), so you can expect it to have a single solution. However, actually solving the equation is not difficult; do it, to confirm this.
It is x = +/- 2 depending on whether the second term in the equation is -12x or +12x.
Unfortunately, the browser used for posting questions is hopelessly inadequate for mathematics: it strips away most symbols. As a result there is no equation in the question and so there can be no answer. It makes little sense for me to try and guess - I may as well make up my own questions and answer them!