$x^2+x-22=x-7$
$+\left(-\frac{5}{7}-\frac{13}{7}\right)^{-1}$
$3x-0.4x+0.8x$
$1.5+3-1.5$
$\int\cos\left(10x\right)\cos\left(3x\right)dx$
$\sec^2\left(1.570\right)$
$-10\:-\:\left(-21\right)$
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