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-1-√2+√10-(3-√2)+3(√10-2)=-1-√2+√10-3+√2+3√10-6=4√10-10
b)
c)
d)
|3x+1|=2
3x+1=2 lub 3x+1=-2
3x=1/:3 3x=-3/:3
x=1/3 x=-1
x∈{-1 ; 1/3}