$\left(x+y\right)\left(a+b-1\right)$
$3xy+x=y-6$
$\ln x-\ln7=2$
$\left(x^2+4\right)\left(x+2\right)$
$x^2+x+6x-2$
$+6\:+8p^1\:+5\:+p^2$
$\left(-27\right)-\left(-12\right)$
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