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Without knowing what "x" is, we cannot say what the answer will be. And without knowing the answer, we cannot solve for "x".
Set x at zero, for example. Zero squared is zero, plus 6 time zero which is zero, minus 55. Your answer is then -55.
Set x at one, for example. One squared is one, plus 6 times 1 which is six, minus 55. Your answer is then -48.
Etc.
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