$20-\left(-4+2\right)$
$1+5\cdot\left(4+9\right)\cdot3+2-1\cdot\left(3-2\right)$
$\left(-5\right).\left(+4\right).\left(-25\right)$
$-171\left(-12\right)$
$2\cdot\left(3x^2+2x-\sin\left(\frac{x}{2}\right)\right)$
$\left(2b+6\right)^2$
$-5=25$
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