$x+9=13$
$25x^2^2$
$5abc^4-80ab$
$x\cdot2^4$
$x^2+10x=-9$
$f\left(x\right)=\frac{11}{4x^3}-\frac{7}{9x}$
$m\left(x\right)=x^4-x^4+x^2-6+x+3x-2$
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