$2b+5a-6b-2a$
$\int\frac{9e^{9x}}{8+e^{9x}}dx$
$50-\left(50-100\right)-90$
$\left(-10\right)+\left(-8\right)+\left(1\right)+\left(-6\right)+\left(-1\right)$
$\left(2xy+z\right)^2$
$-5\left(-10x+3\ \right)$
$3x+7>-10+2x$
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