$8+13-\left(-1\right)$
$4xy^2=x^2$
$1+\left(-98\right)-\left(-33\right)$
$\sqrt{7\cdot4+28-2}$
$12^3a+36ab+54b-b^3$
$\left(2xy-9x^2\right)dx+\left(2y+x^2+1\right)dy=0$
$-5r+5$
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