$\left(5x-7y\right)\left(x+3y\right)$
$\lim_{x\to0}\left(\frac{5^x-1}{x^{5^x}}\right)$
$x^2+8x+49=35$
$-15-4x=6-3x$
$4-12i-9-125-150i-60i^3$
$\frac{x^2-2x+2}{x+1}$
$\left(\frac{1}{3}x^2-\frac{1}{5}y^5\right)^3$
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