$25x^2+ab+4=0$
$\left(3.5\right)-\left(-30.6\right)$
$\left(x^3+5x\right)\left(x^3-5x\right)$
$\int-4x\cdot\cos\left(7x^2\right)dx$
$\:\frac{x^5-2x^4+4x^3-4x^2-x-1}{x^2-2x+1}$
$-\left(-2+6-8+3-1\right)$
$-\:12\:ab\:+\:7\:ab$
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