$15x^2-2x+9=0$
$\int\left(\sqrt{x}\frac{-1}{\sqrt{x}}\right)dx$
$\int x e ^ { 6 x - 2 } d x$
$78+\left(1^{13}\right)$
$7,5\cdot7$
$x^4-8x^2+12$
$2x^2-4x^2=16$
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