$\left(-1250\right)\:-\:\:890\:-\:\left(-130\right)+\:1560\:-\:\left(-300\right)\:+\:1800$
$2x+3y+2=1$
$\left(x^{-3}\right)\left(x^{-3}\right)$
$y\left(x^2+49\right)=98$
$a^2\left(a+1\right)+a\left(a+1\right)+3\left(a+1\right)$
$\left(\frac{a}{b^3}\right)^4$
$-\int\frac{9}{x^2}dx$
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