Проверь, верно ли раскрыты скобки.
-(a-b+c)=-a+b+c
-(u+v - (-w))=-u-v-w
-(d+e+(-f))=-d+e-f
-(a-b+c)=-a+b+c
-(u+v - (-w))=-u-v-w
-(d+e+(-f))=-d+e-f
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