$0\cdot\left(-1234\right)$
$\left(-81\right)\::\:\left(-9\right)\:\:$
$5a^2+b^2;\:a=2;\:b=3$
$\left(10a-ab\right)^2$
$-3x^3+4x^2-7x;\:x=-2$
$\int\frac{x+1}{x\left(7x-1\right)\left(9x-1\right)}dx$
$\left(4f-\frac{g}{2}\right)\left(16f^2+2fg+\frac{g^2}{4}\right)$
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