$y=-\frac{x^2}{45}+x$
$18x^2+26x+15$
$\frac{7ab^2c}{6}\:-\:\frac{2ab^2c}{3}$
$4\cdot7+12\cdot7-10$
$+8+1+1$
$-2+\frac{x^2}{2}$
$\int4^{x+1}dx$
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