$5x\:+\:3y\:=-26\:$
$2.6r\:+\:1.3\:=\:-16.9$
$\frac{cos\left(-x\right)}{tan\left(-x\right)}-sin\left(x\right)$
$\frac{7.895}{34}$
$2\sin^2x+senx-6=0$
$x\left(x+2\right)\left(x+7\right)$
$y2\:-\:18y\:+18$
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