$\left(11x+13\right)\left(11x-6\right)$
$x-18+x-2$
$15cot\left(x\right)+3=2cot\left(x\right)+16$
$1551\cdot11$
$2x^2-2x-15=0$
$\left(4x+3y+2z\right)^2$
$\left(9x^5-y^7\right)\left(9x^5+y^7\right)$
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