91)
$9a^2-(+3a^2)$ =
= $9a^2-3a^2$ =
= $6a^2$
$-15x-(-20x)$ =
= $-15x+20x$ =
= $+5x$
$-8a^3b-(-5a^3b)$ =
= $-8a^3b+5a^3b$ =
= $-3a^3b$
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