$25x+9=5x+49$
$\int0.3dx$
$\cos\left(x\right)=\frac{\pi}{6}$
$\left(a^2-b^2\right)\left(a-b\right)$
$7+10+90$
$\frac{1614}{-3}$
$1+x^2-3+2y+7x^2+3+3y$
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