But avoid Asking for help clarification or responding to other answers. You cannot write -18 - 67. And the best way to get rid of these parentheses is to kind of multiply them out.
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2x23x-4text if x-1 Substituting the value of -1 for the variable xin this expression is pretty straightforward. For example x y x y. Terms inside the bracket are evaluated first. So the easiest way to explain.