$5xy^2-6xy^2$
$\left(-5\right)^2+\left(-3\right)\left(-2\right)+\left(-7\right)$
$\frac{3x^4+2x+3}{x^2-3x+2}$
$\frac{a^2b^3}{-a^2b^3}$
$-x^2+4x+7=0$
$\left(-12\right)-\left(-6\right)-\left(-7\right)$
$3x^2+6-1$
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