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ilość elementow: 5
czyli (5 + 2 + x + 1 + 1 ) / 5 = 2,1
9 + x / 5 = 2,1
9 + x = 2,1 * 5
9 + x = 10,5
x = 10,5 - 9
x = 1,5
=
mnożymy na krzyż
9+x=5*2,1
9+x=10,5
x=10,5-9
x=1,5
spr==2,1
opd x wynosi 1,5