$25.75-20$
$\frac{x^2-3xy-10y^25}{y^2+4xy-x^2}$
$t\cdot\frac{dy}{dt}+2\cdot y\:=\:t^{2\:}-t+1$
$8\cos^2\left(x\right)=2$
$2^5\:x\:2\:^4\:x\:2\:$
$-7\sqrt{7}-3\sqrt{7}$
$-3\:-\left(7+3\right)$
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