$\frac{x-1}{4}+\frac{x}{3}=\frac{x+1}{2}$
$20x+19y=2019$
$\lim_{x\to0}\left(\frac{\sqrt{7+x}-\sqrt{5}}{x}\right)$
$3\left(5y^6+14y^3-9\right)$
$\left(x+3\right)\left(x-2\right)=3$
$\left(2c-2q\right)^2$
$\left(125\right)-\left(-78\right)$
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