$\log\left(x^2+x\right)-\log\left(x+1\right)=1$
$2x^2-5x+2$
$\frac{2\sin\left(45+x\right)}{\sin x+\cos x}$
$9.8m^2\cdot80$
$6^{3x-4}=36^{2x+4}$
$\frac{d}{dx}\frac{1}{x}+\frac{1}{y}=3$
$\left(x+6\right)^2-\left(x+8\right)^2+4x+37$
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