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2a-5b+(7-3a-2b)=
4-14x-(2x[<do potegi 3]-5x+3)=
-(6st+2s)+4st+2s=
(3m+8n-9)+(15-m-n)
(-4a[<do potegi 3]+7a[<do potegi 2]-1)-(2a[<do potegi 2]+3a-1)
(-xy+5y-x)-(xy+2-y)
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a) 2a-5b+(7-3a-2b)= 2a-5b+7-3a-2b= -a-7b+7
b) 4-14x-(2x³-5x+3)= 4-14x-2x³+5x-3= 1-9x-2x³
c) -(6st+2s)+4st+2s= -6st-2s+4st+2s=-2st
d) (3m+8n-9)+(15-m-n)=3m+8n-9+15-m-n= 2m+7n-6
e) (-4a³+7a²-1)-(2a²+3a-1)= -4a³+7a²-1-2a²-3a+1= -4a³+5a²-3a
f) (-xy+5y-x)-(xy+2-y)= -xy+5y-x-xy-2+y= -2xy+6y-x-2