$2a+3b-7=15$
$\left(2m+9\right)\left(2a-9\right)$
$9x^2-36x+4y^2=0$
$y^2=4x^3+22x^2$
$\frac{x^2-20x+x}{x+5}$
$6\frac{da}{dx}+12a-24\cos\left(2x\right)$
$-\left\{-\left(-4\right)-\left(-7\right)\right\}$
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