$a+3\cdot a-1$
$5+5\left(9-4k\right)$
$20+30x-10$
$2^3\:+\:-4^3$
$x^2+20x+34=0$
$\left(\frac{6+\frac{1}{4}y}{3}\right)^2$
$f\left(x\right)=\left(x^4-3x^3+2x\right)^5$
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