$3x+a+5x-2a+x+2a+3xa+5x-2a-x+2a$
$\left(4n+0.5\right)\left(4n+1.8\right)$
$\frac{2}{5a}\sqrt[3]{375a^4}$
$\sqrt{5x}.\sqrt{49x}$
$\left(-5\right)\left(0.2\right)\left(-9\right)$
$-7y-4>26y-94$
$21x+8-12x-7+3x^2-x^2$
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