Question 374979
{{{(-2a+3b-c)-(-7b+3c-3d)=-2a+3b-c+7b-3c+3d=-2a+(3b+7b)+(-c-3c)+3d=-2a+10b-4c+3d}}}



So {{{(-2a+3b-c)-(-7b+3c-3d)=-2a+10b-4c+3d}}}



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