$k\cdot\:2^{k+2}+2+\left(k+1\right)\cdot\:2^{k+1}$
$6\left(5+-3\right)+3\left[-2-\left(-4\right)\right]$
$2x^2-24x-90$
$\left|\left(-11\right)-\left(-16\right)+\left(-12\right)\right|$
$3a^3b^2c+2c$
$10x-x+4y-9x$
$4.7-5.9$
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