$2x^2-y^2+14=0$

$x\cdot9\left(x+1\right)-\left(x+1\right)\cdot6\left(x+1\right)+\left(x-1\right)\cdot3\left(x-1\right)-\left(5\right)\left(x+1\right)$

$64r^2+64rs+16s^2$

$\left(-11\right)-\left(-20\right)$

$4+36+524+36+52$

$4.9x^2-39.2x+34.3$

$5y^{\left(4\right)}y^{\left(3\right)}-x^{\left(2\right)}y^{\left(3\right)}+8x^{\left(2\right)}y^{\left(3\right)}-12x^{\left(4\right)}y^{\left(3\right)}$