$-2x^2+3x+1$
$22.89-48.4$
$0.9\cdot0.5$
$\left(3f^5+2f^3\right)\left(3f^5+2f^3\right)$
$\left(i-1\right)^3$
$\int\left(a-x\right)^7dx$
$11+\left(-16\right)+\left(-40\right)-\left(-19\right)$
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