$5a^7b+26-8\:\:\:\:\:\:\:\:\:+\:\:\:\:\:\:-3a^7b-7$
$\left(15-x^2\right)^2$
$\frac{\sec\left(x\right)-\tan\left(gx\right)^2-1}{\left(\sec\left(x\right)+\tan\left(gx\right)^2-1\right)}$
$8\left(-4x-4\right)$
$x+12=\left(x+7\right)$
$\:2^2+234+4^2$
$\left(x^2-3\right)\left(x^2+10\right)$
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