$20x^2+30x^2$
$x^2+3x\ge-2$
$2x+x+2x+x$
$\left(6x^3-x\right)\left(10-20x\right)$
$-40\cdot x^2+280\cdot x=0$
$\int\left(5x-2\right)\sqrt{x+2}dx$
$100+50+d^2$
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