$\left|\left(+5\right)+\left(-3\right)\right|+\left(+7\right)$

$\left(2y^2y^3\right)\left(3xz^2\right)\left(5y\right)$

$\lim_{x\to\infty}\left(\sqrt{\frac{1+4x^2}{1+n^2}}\right)$

$4x\:+\:9\:+\:12x\:-\:3$

$-6-\left(+7+\left(+1\right).\left(-1\right)\right)$

$\left(\frac{3}{6}w\frac{1}{2}y\right)^2$

$15x^2y-4x^2+6x^2-11x^2y$