$6xy=x^4+3$
$cos\left(5\pi+x\right)$
$6x^2-60x+36=0$
$16x+2y+5+11x-2y-9$
$12z-9.4z+8.92=-14.3+0.8z$
$\lim_{x\to0}\left(\frac{x^2}{2x+3}\right)$
$\left(3x^4+5x^3-7x+2\right)-\left(3x^4-6x^3-x+5\right)$
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