$\left(y^3+10xy^4-8x\right)dx+\left(3xy^2+20x^2y^3\right)dy=0$
$m2-13m+30$
$-4\cdot7-7$
$-\left(-2+6\right)$
$\int\left(4x-10x^2\right)\left(4-20x\right)dx$
$\left(10x^4-3x^2+15\right)\cdot\left(2x+3\right)$
$-2x+5\ge4x-3$
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