$7ab+7bc-5ab+2bc$
$\left(1-5t\right)^2$
$-\frac{36}{\left(-\frac{8}{\left(-5+3\right)}+\frac{12}{\left(-2+2\cdot4\right)}\right)}+3\cdot\left(-8\right)+3\cdot\left(-12+5\cdot2\right)$
$\frac{x\sqrt{x}}{1-x}$
$\left(a+1\right).\left(a+5\right)$
$10^5\cdot10^{-7}$
$sec\left(x\right)csc2\left(x\right)cos\left(3x\right)$
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