$\left(+5\right).\left(-3\right)+\left(-7\right)$
$8w^7\left(2w^2\right)w$
$58=4\left(w+4\right)+3w$
$-2x+2y=-8$
$-3\:.\:-27$
$\frac{1}{1+sinx}-\frac{1}{1-sinx}=2\sec^2\left(x\right)$
$-\left(-2\right)\cdot\left(+7\right)\cdot\left(-5\right)$
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