$\left(-t^4-5t^3-10t^2\right)+\left(9t^3+3t^2-1\right)$

$\left(d^{\frac{\left(2\right)y}{dx^2}}\right)^{4+2y=4\left(x+1\right)^2}$

$2x^2+5x>\:3x-1$

$\frac{1}{2x}-2-\left(\frac{1}{6x}\right)$

$5\cdot\left(-2^2\right)\cdot\left(-3^3\right)-\left(-4\right)-4\cdot\left(-1\right)\cdot5+3\cdot5\cdot\left(-4\right)\cdot3$

$9y\:+\:3xy\:-\:\:+\:8xy\:+\:1\:-\:5\:-\:3xy$

$5y\left(a-2\right)+x\left(a-2\right)n^2+16nm+64m^2$