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0,6x+21=2x /*10
6x+210=20x /-6x
210=14x /:14
15=x
SPRAWDZENIE:
0,6*15=9
2*15=30
9+21=30
6x=20x-210
14x=210/
2x=30
x= 15
60%=60/100=6/10=0,6
x-szukana liczba
60% z "x" to 0,6*x
0,6x+21=2x /-0,6x
21=1,4x /:1,4
15=x
spr.
L=0,6*15+21=9+21=30
P=2*15=30
L=P