Algebra an exact science, if the decision task is performed incorrectly, then the verification work will not accept the teacher, or appreciate it, but at the low estimate.
mathematics is difficult to understand. The calculations have to be flawless, even the smallest mistake can cause you lose the entire progress of the solution. Therefore, before an independent decision problems, think, are You confident that the solution will perform correctly, that all calculations are correct and You put a good estimate? If still You doubt, you better seek help to us.