Ответ:
-(x-4)×(x+3)+x×(x+3)=3x-7
(x+3)×(-(x-4)+x)=3x-7
(x+3)×4=3x-7
4x-3x= -7-12
x= -19
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Ответ:
-(x-4)×(x+3)+x×(x+3)=3x-7
(x+3)×(-(x-4)+x)=3x-7
(x+3)×4=3x-7
4x-3x= -7-12
x= -19