$sen\left(2x\right)-2cos\left(x\right)+sen\left(x\right)-1=0$
$\left(1+csc\:\left(\theta\:\right)\right)\left(1-csc\:\left(\theta\:\right)\right)=cot\left(\theta\:\right)\:cos\left(\theta\:\right)$
$3\left(x-2\right)+5x=26$
$2x^2+3x-x^2-x$
$5k\:-\:3k\:-\:5$
$3\left(2x+\frac{5}{8}\right)$
$-2\left(1\right)+29$
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