$-437+-918$
$-20+5f=90$
$-8n-4+n+7$
$12-\left(14-\left(9-15\right)+6\right)$
$2x^{4}+4xy$
$x^2+y^2-9=0$
$-5\left(b+3d\right);\:a=-2;\:b=6;\:c=5;\:d=-1$
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