$sin\:\frac{x}{2}=0.4$
$12x-\left(4x-9\right)$
$-7y-2-4x-2x+6x+6y-2$
$\frac{2x^2+x-1}{x^2-1}$
$-\frac{3x^2}{50}+\frac{5x^2}{100}$
$\lim_{x\to-3}\left(x^2-3x+9\right)$
$m+3\cdot m+3$
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