Question 341839
No,no,no.
If {{{a+b=c}}} and you cube both sides, you get {{{(a+b)^3=c^3}}}.
You can't just cube the individual terms, you're missing cross terms.
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{{{root(3,2x+3)+5=2}}}
{{{root(3,2x+3)=-3}}}
Now cube both sides,
{{{2x+3=-27}}}
{{{2x=-30}}}
{{{highlight(x=-15)}}}