$2x+55=7x$
$\frac{2}{3x}\times\frac{y}{5}$
$ikx+bx^2$
$-12,43+8,1$
$\lim_{x\to0}\left(\frac{5-\cos\left(9x\right)1}{sin\left(7x\right)-7x}\right)$
$\int x\left(x^2+x+1\right)dx$
$-16\cdot4$
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