$25\left(x-y\right)^2$
$-81-1$
$\frac{36}{4}-18$
$3,45-2,45\cdot1,2$
$\left(-12xy+16x^2y^2-3xy^2\right)-\left(-9xy+4xy^2+7x^2y^2\right)$
$2x^2+3x-3=y$
$4x^2-4\sqrt{30}x-30$
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