$b^2\:x^2+a^2\:y^2=a^2\:b^2$
$x^{2}y^{2}-10xy^{2}+25y^{2}$
$\left(1-90\right)-\left(-70\right)$
$x2+8x+6$
$3b^3+24$
$-6\:x\:y\:-\:6\:y^2\:-\:12\:y$
$8a+3b-9c\:\:;a=2;\:b=5;\:c=-8$
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