$\left(4x+10\right)\left(4x-12\right)$
$\frac{\left(-4-12\right)}{4}$
$15x\:+\:20$
$93.65+2.7$
$-10+4\left(3\right)-7$
$f\left(x\right)=\frac{x+2}{x^2}$
$2sec\left(x\right)+3=0$
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