$15+2x-x^2$
$5t\:\frac{3m}{s\:}\:1$
$12x^3y-18^2y+4^2y^4-6xy^4$
$0+\ln\left(0\right)$
$\frac{2x^2-1}{x-2}$
$42+42+42+42$
$3\cdot12\sqrt{3}$
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