$\lim_{x\to2}\left(\frac{x^2+x-6}{x-1}\right)$
$x+3<3x-7$
$10x^2-5x^5+15x^3$
$\left(-4x^3\right)\cdot\left(-3x^2\right)$
$6x^4+2y^2$
$\left(1+e^{2c}\right)^2$
$\left(10j-7\right)\:-\left(-9j+2\right)$
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