$100x^4y^6-121m^4$
$-0.3-0.8$
$-89-96+69^{2}-36^{2}$
$2\sin\left(x+\pi\right)-1=0$
$\left(x^2-x\right)^3$
$4\left[75-\left(7-1\right)^2\right]$
$-12x-4=-2x^2$
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