$-3a+4b-6a+81b-114b+31a-a-6$

$1^3+5^2$

$^{-2^3}$

$4x-2>8x-2$

$3cos\left(\frac{3y}{7}\right)sen\left(\frac{y}{2}\right)+14cos\left(\frac{3y}{7}\right)=0$

$ab-4a+3ab-3+6a-7ab+8+ab$

$-\left(+8\right)\:+\:\left(-3\right)\:-\:\left(-15\right)\:-\:\left(+6\right)\:-\:\left(+2\right)$