$-7ab+3b-5ab-7b$
$\sqrt{a^2b}.\:\sqrt[3]{a^2b^4}.\:\sqrt[5]{ab^4}$
$sin^2x+7=0$
$-8x-\left(-14+22-5\right)-15+x$
$\frac{x^2}{4}-\frac{x^2}{4}-x+4$
$\frac{6}{\left(x+y\right)^2+1}-\frac{6}{x^2+1}$
$y^{''\:}+4y^'-y=0$
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