Question 1070844
Any exponents?  No.
Work inside parentheses  (if possible) first.


{{{-2c-(2a+3b-2b)-(6d+b-3c)-10d-9a}}}
{{{-2c-(2a+b)-(6d+b-3c)-10d-9a}}}
{{{-2c-2a-b-6d-b+3c-10d-9a}}}
Combine like-terms
{{{-2a-9a-b-b-2c+3c-6d-10d}}}
-
{{{-11a-2b+c-16d}}}---------result






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Wrong results below, due to mistake in sign of or in handling terms of b:
{{{-2c-((2a+3b-2b)-2b)-(6d+b-3c)-(10d+9a)}}}
{{{-2c-(2a+b-2b)-6d-b+3c-10d-9a}}}
{{{-2c-(2a-b)-6d-b+3c-10d-9a}}}
{{{-2c-2a+b-6d-b+3c-10d-9a}}}

Combine LIKE-terms.
{{{-2a-9a+b-b-2c+3c-6d-10d}}}
{{{-11a+c-16d}}}----------incorrect