$-2x-4x-2x-4x$
$12x^2+6x^3-18x^2$
$5m^4-3m^3+7m-9$
$11\left(x-3\right)+\frac{\left(x-3\right)^2}{2}+30\ln\left(x-3\right)$
$\lim_{x\to0}\frac{5x^2}{\sqrt{\left(1+x^2\right)}-\cos\left(3x\right)}$
$12\sqrt{3}-12\sqrt{3}$
$5x+2=127$
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