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6:2=3
12,5-3=9,5
12,5+3=15,5
te liczby to 9,5 i 15,5
spr. 9,5+15,5=25
x=y+6
y+6+y=25
2y=25-6
2y=19 / podzielic przez 2
y=9,5
x=9,5+6
9,5+6 = 15,5
15,5+9,5=25