$2a-2b-5b+9a$
$\lim_{x\to0}\left(\frac{xcos\left(x\right)-2sin\left(x\right)}{x^3}\right)$
$\frac{x^2+x+1}{x+1}$
$\left(-5z+2y\right)-\left(2z-5y-7x-1\right)+\left(-32-4y-9x\right)-\left(-4y+8x-5\right)$
$\frac{x}{3}+1=4$
$\log6\left(a\right)=5$
$x<\frac{5}{2}\left(4x-1\right)-2$
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