Since that isn't an equation, there is really nothing to solve.
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You cannot. x3-12x plus 7 is an expression, not an equation. An expression cannot have a solution.
One solution.
4x-9(x plus 1)7-5x?
It doesn't factor neatly. Applying the quadratic formula, we find two imaginary solutions: 7 plus or minus i times the square root of 47b = 7 + 6.855654600401044ib = 7 - 6.855654600401044iwhere i is the square root of -1
It is a quadratic equation that has 2 solutions
x can be anything, if you don't have it in an equation form, can an be an infinite amount of solutions