a+(a-b)
2x-(x+4)
7-(-x+6)
-(x+4)+(x-5)
Z góry dzięki :D
a+(a-b)=a+a-b=2a-b
2x-(x+4)=2x-x-4=x-4
7-(-x+6)=7-x-6=-x+1
-(x+4)+(x-5)=-x-4+x-5=-9
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a+(a-b)=a+a-b=2a-b
2x-(x+4)=2x-x-4=x-4
7-(-x+6)=7-x-6=-x+1
-(x+4)+(x-5)=-x-4+x-5=-9