$3m^2\cdot\left(5m-7n\right)-3n\cdot\left(2m^2+4n\right)$
$5x^2-30x-35$
$\left(x+6\right)\left(3x-5\right)$
$\int x\left(\pi^2-1\right)dx$
$\left(5x^7\right)^4$
$\left(4x+3y+2\right)\left(x+5y\right)$
$- 2,8 - - 15$
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