$15y^3+20y^2+5y$
$x=1.89-2.1y$
$18+\left|13+4-\left(5-7\right)+6\right|$
$3x+x+4y-y+z$
$\log_n\left(36\right)=2$
$\sqrt{8a^4b^6}$
$37+15c+31+16+12$
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