0
\\
\\x^2+x-7x-7>0
\\
\\x(x+1)-7(x+1)>0
\\
\\(x+1)(x-7)>0
\\
\\f(x)\searrow \ x\in(-\infty,-1)\cup(7,+\infty)" alt="\\f\prime(x)=-3x^2+18x+21
\\
\\-3(x^2-3x-7)<0/:(-3)
\\
\\x^2-6x-7>0
\\
\\x^2+x-7x-7>0
\\
\\x(x+1)-7(x+1)>0
\\
\\(x+1)(x-7)>0
\\
\\f(x)\searrow \ x\in(-\infty,-1)\cup(7,+\infty)" align="absmiddle" class="latex-formula">
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