$\log\left(x\right)-\log\left(y\right)$

$f\left(x\right)=\left(\frac{\left(x+1\right)^2}{\left(2x-4\right)^{11}}\right)$

$21y^2-29y-72$

$29-34-91-22+42+57+86+10-7$

$\left(25x^2y^4-121\right)\left(25x^2y^4+121\right)$

$4\:\left(-6\right)\:\left(-4\right)\:\left(7\right)$

$350-\left(7-2+5\right)-\left(6+3\right)+\left(9+8-2\right)$