$\:3x\:-\:6y\:-2a\:+\:7x\:-\:8y\:-\:2a$
$12a^3b=18ab^3$
$\frac{5x-6}{2}>x+2$
$-5x^2+22x-8$
$\left(3ab+4c\right)^3$
$a^2+12a+27$
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