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Dane :
x- pierwsza lb.
4x- druga lb.
x-8 - trzecia lb.
suma=28
x+4x+(x-8)=28
5x+x-8=28
6x=28+8
6x=36 / :6
x=6
pierwsza lb=6
druga lb=24
trzecia lb = (-2)
9.dane:
x-pierwsza lb
3x -druga lb
3x-1-trzecia lb.
x+23 - suma
x+3x+3x-1=x+23
7x=x+23+1
6x=24 /:6
x=4
pierwsza lb=4
druga lb=12
trzecia lb=11