$\left(25\:-\:9x^2\right)^2$
$9x^2\cdot b^2-25$
$4w^{2}-28w+49$
$xy+3+3x^2=5$
$\frac{1}{nx}+\frac{1}{n+x}$
$\int_5^x\:\frac{3\left(x-5\right)^2}{875}dx$
$x+x^2=10$
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