$a.\:30\:-\:20\::\:5\:+\:15$
$\left(-7x^4y^9\right)^3$
$2x^7+3x^6-5x$
$x^2-10x+21=0$
$\int\left(\frac{\frac{5}{3}x^4}{\left(4-x\right)^{\frac{1}{5}}}\right)dx$
$\int x\cdot\left(x^3-1\right)^5dx$
$-x^2+6=x^2+4x$
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