$15y+5x-7y+x-3y$
$\left(2a-8\right)\left(2a+6\right)$
$8x\cdot2x^2\cdot2x^6$
$\left(6\cdot8\right)-\left(2\cdot4\right)+30$
$\frac{20a^8b^2}{4a^2b}$
$\frac{2y^2\:.\:2x}{2y^2\:.\:3y^2}$
$\int-\sen\left(\frac{x}{a}\right)dx$
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