$-\left(+42\right)\::\:\left(+7\right)$
$\left(2q+3s\right)^2-6\left(2q+3s\right)+9$
$2x^2+11x$
$y^2-8x=0$
$\int\:\:cosh\left(8x-23\right)sinh\left(8x-23\right)dx$
$12a+15a+18a$
$\left(-5.4\right)-7.8$
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