$\frac{d}{dx}7x^2-9y+8x=0$
$27x^3+1000y^6$
$10m+15n+20g$
$6:-12$
$-57-\left(-153\right)+\left(-34\right)-55$
$\left(140-3x\right)^2$
$\sqrt{\frac{5}{4}x^2}$
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