$\:3b\:+\:2a\:-\:9b\:-\:5b\:+\:7a\:-\:3b$
$14x-8x+x$
$-89-54$
$\frac { ( 1 + x ) ^ { 2 } - 1 } { x }$
$\frac{a}{2}=3$
$\int\frac{4x+1}{\left(2x^2+x\right)^4}dx$
$\left(-625\right)-\left(825\:\right)$
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