$18+x=27$
$\int_{-\pi}^{\pi}sin\left(t\right)dt$
$\left(1+r-t\right)^2$
$os\left(x-y\right)-cos\left(x+y\right)=2sinx\cdot\:\:siny$
$x-2\left(x+3\right)\ge5-x$
$2.5^2+82.5-10$
$\left(6x^6y^4\right)^{-3}$
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