$3x^2-15x-18=0$
$21x\cdot3$
$\left(a^2+b^2\right)\left(x^2+y^2\right)=\left(ax-by\right)^2+\left(bx+ay\right)^2$
$\frac{-5x+4}{6}\ge3x-5$
$144m^2+144mn+36n^2$
$3x+2y-5=0$
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