$-135-\left(-141\right)$
$x^2+x-1$
$i'=\frac{1+2t}{2i}$
$4x-7y+25=0$
$\frac{dy}{dx}+y^2+y=0$
$3x^2+3\left(-8x+16\right)-13\left(x-3\right)=3$
$a^23^4-14ab^2+48$
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