$\left(10.r^{10}.y\right).\left(7.r^{10}.y\right)$
$3\left(1\right)^2-21\left(1\right)+30$
$\left(-15\right)^2\::\:\left(-5\right)^2$
$20x^2-20x+25$
$\int6x\left(6x^2+2\right)dx$
$\frac{1}{3}x+8x^4-\frac{2}{3}x^2-x$
$-3+\left(-2\right)-\left(-1\right)-3$
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