Question 1125929
...., to solve an quation x^2 -2=7  ,...



{{{x^2-2=7}}}
{{{x^2-2+2=7+2}}}
{{{x^2=9}}}


{{{system(x=3,or,x=-3)}}}



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Those just ARE the steps.  Nothing else to explain.  The solution cannot be made any simpler.  The only "method" which makes sense is isolate the {{{x^2}}}, and then factorize the ,... 9.