$-37-\left(-30\right)$
$\int_1^{\infty}\left(\frac{\left(ln\:x\right)}{x}\right)dx$
$x^2-2x+1=x^2-3x+x+1$
$10a^2+30a+40=a^2-6a+4$
$4x\left(x\:+\:6\right)\:-\:5y\left(x\:+\:6\right)$
$\int\frac{1}{r^3+r^2-2r}dr$
$x^2-34x+269$
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